Methods ventilation device in a room without windows

Ventilation in a room without windows is an urgent problem, because, if you do not organize automatic air purification, the room will be uncomfortable. It becomes stuffy, it is wet, starts to form fungus, such air elementary harmful to breathe. In order to avoid many problems, You need to consider ventilation system.

How to check if no window space is ventilated?

Most often in houses, especially the multi, builder provides natural ventilation system. It is arranged as follows:: air exchange takes place by vertically extending channels, which extend from the roof of the house to the basement. Special taps unventilated room apartments are connected to the ventilation system. For many reasons, the ventilation in the room may not work.

In order to check the efficiency of the ventilation system, you need to burn rolled in a tube sheet of paper and bring to the grid. Keep it should be at a distance 2 cm, If the paper is pressed against the grate, the ventilation is working properly, and air circulation nothing prevents. If the smoke goes into the room or sheet will not be pressed under the influence of air flow, the drawing is not.

Council: checking, how the system, Do not use an open flame. Newsprint must smoke, but not burn. An open fire can be dangerous, since the carcass exhaust pipe may form flammable and flammable substance different.

The role of systems for air circulation

Ventilation in the room plays a big role with no windows. Even if the room is used infrequently, it collects carbon dioxide. If the room is always more than one person, heat is generated in the amount of 60 W in time, it creates excess moisture, which in the absence of natural or artificial ventilation will settle on the walls. As a result, inside will be very hot, on the walls of the fungus forms, disputes which breathe is dangerous for health.

Clean air ducts can not always provide fresh air flow in the right amount, even if the room has a window. The fact, that deaf plastic products reliably isolate the room. This has positive aspects, but there are also cons, eg, the room is not ventilated itself. With the help of special equipment problem can be solved: the system will be forced to ventilate the room.

Construction of mechanical ventilation

knowing, how to make the ventilation in the room without windows or with blind structures, you can do the work yourself. two fans will need to, having approximately the same power. Besides, You need to purchase a heater and filter; one device will suffice for the system.

To the air where it was taken, punched in the walls for ventilation channels. There are inserted pipe: everything for holes they need to use a hammer.

The diameter of the channels for ventilation

It is not enough to pierce a through hole of any size: we must act, based on the calculation, What’s on 1 m 2 hole diameter should be 1,5 cm; if the room 20 m, You need to punch a hole 20 cm.

DA to ventilation worked well and it does not interfere, positioning hole must be slightly above floor level. On the street duct should go 40 mm. It should be up to direct: This will ensure optimal air intake, the impact of polluted air from the room. In order for the pipe does not enter the trash, it protects the awning and a special grid.

Ventilation in a room without windows is performed in a duct with perforations on the walls, it can be positioned vertically or, either horizontally. You need this device in order, so that the air is distributed evenly in the room. To ensure extract stale air, mounted hood. It is located in the upper part of the wall, approximately at 50 cm from the ceiling, if the house is private, pipe must be raised above the roof to a height of not less than 30 cm. The apartment can put it against the wall at the same height. In both cases the tube should be facing up.

ATentilyatsiya in a room without windows would be more effective, if extract pipe also equipped with a visor by depositing and mesh. It would not let her hide various waste.

In order to efficiently inhale the air into the air duct, you want to use enough power fan. Outdoor air enters the room, previously passed through a filter.

Calculator for ventilation

The choice of ready-made solutions

If the bedroom without a window, ventilation may be undeveloped using factory devices, feed fresh air: they are called aerogiverami. Most often, such a device is installed outside the window. The system will not spoil the appearance of the facade, because it has a small size, placed in a special box, whose color can be chosen, outer side closed a practical and attractive appearance bars, through which the air intake.

The average cost of imported aerogivera 25 thousand. rubles. The device is suitable for indoor use, the area of ​​which does not exceed 35 m. Some aerogivery have the function of heating: it is convenient in the winter, because the room will go hot air, It will not feel a draft, the room will not cool. As a result, operation of the system reduces heat loss and save on heating.

Depending on the model and manufacturer aerogivery can operate in different modes: eg, You can set the desired fan speed. More expensive devices show, how the filter is dirty and when it’s time to change it, which greatly facilitates maintenance, avoids loss of productivity and damage. Details of ventilation systems.

Conclusion: If you have a room without a window, ventilation it is necessary. It will make the room comfortable and safe for health. What type of ventilation to choose, It depends on your preferences and financial capabilities of the landlord.

What to do with room with no windows

You are in a room with no windows, doors or any exit. The only items are a mirror and a table. How do you escape?

Hint: This is not a typical brain teaser.

Look in the mirror, then at the wall and back at the mirror to see what you saw. Use the saw to cut the table in half and join the two halves to make a whole. Put the “hole” on the wall and climb out.

I know, it’s lame. I like to have brain teasers that you can realistically guess, but this one’s so popular, I feel an obligation to include it.

Similar ones

36 Comments on «A Room With No Windows»

You look in the mirror to see what you saw, you take the saw and cut the table in half, two halves make a whole then you climb through the hole!

You look in the mirror, see what you saw, then saw a circle out of the room

You look in the mirror you see what you saw, you take the saw cut the tables in half, put the two halves together which makes a hole, climb through the hole and yell until your voice is hoarse, then take the horse and ride away!

Look in the mirror, see what you saw, grab the saw, two halves make a whole. Put the two halves on the wall. crawl through the whole and your out!

There is no saw in the room. There is only a table and a mirror.
So how did he cut the table…. -.-

It’s a play on words. See the answer for a more thorough explanation.

If you don’t understand it don’t think logically in this riddle. This riddle requires a person to string a bunch of words, including all its meaning

look in the mirror to see what you saw you take the saw and cut the table in half two halts make a hole and you go in the hole

I wiil not understand this ans

ayesha, it is a play on words:
Look in the mirror, see what you saw, grab the saw, (so now you have a saw)

Take the saw and saw the table in two halves
two halves make a whole (sounds like ‘hole’). Put the two halves on the wall. crawl through the whole (hole) and your out!

this riddle is a play on the English language, using Homophones. other languages will not have this issue as often as English does.

How about just breaking the mirror or table in twos or threes, putting it together for the ‘whole’ and climb through it. Skip the saw part, cause ultimately the ‘hole’ is needed to climb out of.

Just stop imagining

Look in the mirror(saw), take the saw, saw the table, put them back together (whole), and go through the hole.

Y’all think too much about it. It’s a damn riddle. Something to be fun. Jeez. You guys are waayyyyy too serious about a joke

You don’t hardly need the table. Eventually you will get bored, and then you can just saw the board in half.

Look in the mirror to see what you saw, take the saw, cut the mirror in half, two halves make a whole, and then you climb through the hole. — no idea what the table is for.

OKAY OKAY we get it everyone has said the answer if u don’t get it too bad.

you look in the mirror and you see what you saw, you use the saw to cut the table in half, two halves make a whole and you jump through the hole.

You look in the mirror to see what you saw. You use what you saw to cut the tame in half. You use the halls to make a whole and then you get out.

.Sorry guys but if you’re in a closed room with only two items it’s impossible to see a saw. You’re screwed.

You see what you saw you take out the saw you cut the table in half 2 halves make a whole. you go through that hole.

U break the table in half, a half makes a whole and u crawl threw the hole lol. Or u can still do the mirror one works.

Punch the center of the mirror. Take a large shard of the broken mirror… Probably not a good sign that was the first place my head went.

this is still the most absurd riddle to imo…my dad told it to me once a year at least. he knows other, better riddles. he just likes this one. I never remember how it ends until I google it.

when he climbed out he found he was at the top of a cliff with no way down. The rain was coming down in sheets so he grabbed some and tied them together and climbed down. A river flowed at the bottom of the cliff so he walked along until he came to a ford. He jumped in the ford and drove off until he came to a fork in the road which gave him a flat. When he climbed the stairs of the flat he found two tarts. He ate the first one but the other one had a ladder in her stocking. He climbed the ladder and hasn’t been seen since.

U look in the mirror u see what u saw, u take the saw, cut the table in half, two halves make a whole and u jump through the hole

You look in the mirror, you see what you saw, you take the saw, saw the table in half, two halves make one (w)hole, you jump through the hole, you scream until your voice is hoarse, you jump on the ho(a)rse, and you ride away!

you only say the items are the mirror and table, where is the saw dome from?

This riddle should be removed from existence.

You are in a room with no windows, doors or any exit. The only items are a mirror and a table. How do you escape?

No windows, no doors, or any exit; would assume there is no light to see what could have seen (saw) in the a mirror.
A whole doesn’t make a hole.

One can only presume the person in the box is now part of a quantum study similar to ‘Schroeder’s cat’.

in the original the saw is obtained by scraping your hands against the wall until the are sore

Now this one was kind of easy for me because I know this one by my heart if you ask me I can get this done in like what two seconds but you take a you took the I’m looking at you see what you saw and you take what you saw and cut this table in half 2 add two holes equal a whole so you call through the whole week is how you get this all because when you look in the mirror you see what you saw so you take what you saw and you cut the tape on top get it you don’t really get comment below and I can explain it better puppy while I don’t understand this please explain more

Also the other one is if you have an orange and a knife you cut the orange in half with the knife and then you crawl to go hold because you have equal whole but yeah that’s the other one and that’s really need explaining because it’s really super easy cuz you have a knife in an orange and crawl through the hole so yeah that’s really it so I don’t really need to explain anymore but even if you don’t get it just let me know and I’ll do I’ll explain more

I understand the wordplay now, but i didn’t at first… Y’all helped me out!

You look in the mirror and you see what you saw. You take the saw and cut the table into two halves. You put the two halves of the table together which makes a whole. You climb out the hole and yell until your voice is hoarse. You climb on the horse and run off.

7 Pro-tips for Room

Room is an abstraction layer on top of SQLite that makes it easier and nicer to persist data. If you’re new to Room then check out this primer:

7 Steps To Room

A step by step guide on how to migrate your app to Room

In this article, I’d like to share some pro-tips on getting the most out of Room:

1. Pre-populate the database

Do you need to add default data to your database, right after it was created or when the database is opened? Use RoomDatabase#Callback ! Call the addCallback method when building your RoomDatabase and override either onCreate or onOpen .

onCreate will be called when the database is created for the first time, after the tables have been created. onOpen is called when the database was opened. Since the DAOs can only be accessed once these methods return, we‘re creating a new thread where we’re getting a reference to the database, get the DAO, and then insert the data.

See a full example here.

Note: When using the ioThread approach, if your app crashes at the first launch, in between database creation and insert, the data will never be inserted.

2. Use DAO’s inheritance capability

Do you have multiple tables in your database and find yourself copying the same Insert , Update and Delete methods? DAOs support inheritance, so create a BaseDao class, and define your generic @Insert , @Update and @Delete methods there. Have each DAO extend the BaseDao and add methods specific to each of them.

See more details here.

The DAOs have to be interfaces or abstract classes because Room generates their implementation at compile time, including the methods from BaseDao .

3. Execute queries in transactions with minimal boilerplate code

Annotating a method with @Transaction makes sure that all database operations you’re executing in that method will be run inside one transaction. The transaction will fail when an exception is thrown in the method body.

You might want to use the @Transaction annotation for @Query methods that have a select statement, in the following cases:

• When the result of the query is fairly big. By querying the database in one transaction, you ensure that if the query result doesn’t fit in a single cursor window, it doesn’t get corrupted due to changes in the database between cursor window swaps.
• When the result of the query is a POJO with @Relation fields. The fields are queries separately so running them in a single transaction will guarantee consistent results between queries.

@Delete , @Update and @Insert methods that have multiple parameters are automatically run inside a transaction.

4. Read only what you need

When you’re querying the database, do you use all the fields you return in your query? Take care of the amount of memory used by your app and load only the subset of fields you will end up using. This will also improve the speed of your queries by reducing the IO cost. Room will do the mapping between the columns and the object for you.

Consider this complex User object:

On some screens we don’t need to display all of this information. So instead, we can create a UserMinimal object that holds only the data needed.

In the DAO class, we define the query and select the right columns from the users table.

5. Enforce constraints between entities with foreign keys

Even though Room doesn’t directly support relations, it allows you to define Foreign Key constraints between entities.

Room has the @ForeignKey annotation, part of the @Entity annotation, to allow using the SQLite foreign key features. It enforces constraints across tables that ensure the relationship is valid when you modify the database. On an entity, define the parent entity to reference, the columns in it and the columns in the current entity.

Consider a User and a Pet class. The Pet has an owner, which is a user id referenced as foreign key.

Optionally, you can define what action to be taken when the parent entity is deleted or updated in the database. You can choose one of the following: NO_ACTION , RESTRICT , SET_NULL , SET_DEFAULT or CASCADE , that have same behaviors as in SQLite.

Note: In Room, SET_DEFAULT works as SET_NULL , as Room does not yet allow setting default values for columns.

6. Simplify one-to-many queries via @Relation

In the previous User — Pet example, we can say that we have a one-to-many relation: a user can have multiple pets. Let’s say that we want to get a list of users with their pets: List .

To do this manually, we would need to implement 2 queries: one to get the list of all users and another one to get the list of pets based on a user id.

We would then iterate through the list of users and query the Pets table.

To make this simpler, Room’s @Relation annotation automatically fetches related entities. @Relation can only be applied to a List or Set of objects. The UserAndAllPets class has to be updated:

In the DAO, we define a single query and Room will query both the Users and the Pets tables and handle the object mapping.

7. Avoid false positive notifications for observable queries

Let’s say that you want to get a user based on the user id in an observable query:

You’ll get a new emission of the User object whenever that user updates. But you will also get the same object when other changes (deletes, updates or inserts) occur on the Users table that have nothing to do with the User you’re interested in, resulting in false positive notifications. Even more, if your query involves multiple tables, you’ll get a new emission whenever something changed in any of them.

Here’s what’s going on behind the scenes:

1. SQLite supports triggers that fire whenever a DELETE , UPDATE or INSERT happens in a table.
2. Room creates an InvalidationTracker that uses Observers that track whenever something has changed in the observed tables.
3. Both LiveData and Flowable queries rely on the )» rel=»noopener nofollow»>InvalidationTracker.Observer#onInvalidated notification. When this is received, it triggers a re-query.

Room only knows that the table has been modified but doesn’t know why and what has changed. Therefore, after the re-query, the result of the query is emitted by the LiveData or Flowable . Since Room doesn’t hold any data in memory and can’t assume that objects have equals() , it can’t tell whether this is the same data or not.

You need to make sure that your DAO filters emissions and only reacts to distinct objects.

If the observable query is implemented using Flowables , use Flowable#distinctUntilChanged .

If your query returns a LiveData , you can use a MediatorLiveData that only allows distinct object emissions from a source.

In your DAOs, make method that returns the distinct LiveData public and the method that queries the database protected .

See more of the code here.

Note: if you’re returning a list to be displayed, consider using the Paging Library and returning a LivePagedListBuilder since the library will help with automatically computing the diff between list items and updating your UI.

New to Room? Check out our previous articles: