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29 votes

Is it a bad idea to install a bathroom vent in a drop ceiling without external exhaust?

You need to exhaust the bathroom via a duct in the ceiling void and through an outside wall. You can't just push bathroom air into the void ... it will cause mold up there and push humidity and ...
jay613's user avatar
  • 39.4k
12 votes

Is it a bad idea to install a bathroom vent in a drop ceiling without external exhaust?

The point of a bathroom exhaust fan is to pull humid air out of the bathroom. That humid air must go somewhere. If that "somewhere" is another interior space, you're just moving the ...
Ilmari Karonen's user avatar
5 votes

How can I ventilate my bomb shelter?

Rather than removing the plate, mounting a fan (either a duct fan or a computer fan) that fits in the duct, or mounting a box over the inner or outer end (with the outer end box covering, but not ...
Ecnerwal's user avatar
  • 218k
5 votes
Accepted

Can I use a basement oil tank vent pipe to vent a 3d printer enclosure?

I doubt the vent is much less or more grotty than the fill pipe. The fill pipe may even be cleaner, since oil washed the accumulated crud in it down into the tank regularly, while the vent just sat ...
Ecnerwal's user avatar
  • 218k
4 votes

Trying to replace the bathroom exhaust fan with a new fan and heater. How do I go about it from where I am now?

The old fan looks like just a heater with a fan to blow warm air. There is no evidence that it has ventilating properties. The new fan is a ventilating fan that directs air to the outside. It is not ...
RMDman's user avatar
  • 30.9k
4 votes

Is there a ceiling ventilation outlet that can be remote controlled to open and close?

There are 'motorised dampers' to put in your ductwork: Since these are usually part of a system installation, they're more likely to be hardwired into the control system for your HVAC plant, rather ...
user1908704's user avatar
  • 1,401
4 votes

Can we place a Ninja Foodie XL 6 in 1 convection oven where our conventional oven has been?

Does the "spot where your oven has been" provide adequate clearances for the portable oven you wish to place there? If so, likely with a bit of re-wiring to supply the correct voltage, you ...
Ecnerwal's user avatar
  • 218k
3 votes

MVHR ventilation in a UK flat (apartment)

There are single room MVHR units, also called Decentralised MVHR (dMVHR). They give you a continuous supply of fresh outdoor air while retaining heat from the indoor air that they're pumping out. ...
user1908704's user avatar
  • 1,401
3 votes

How to get rid of fog / odor in a bathroom without windows or an extractor fan?

Bathrooms are required by the International Residential Code (IRC) to either have an operable window or an exhaust fan. If you have a window, use it! That is the easiest solution. If the ventilation ...
manassehkatz-Moving 2 Codidact's user avatar
3 votes

Ventilation for a bathroom

In most places, every bathroom is required to have at least one of: A window that can be opened for ventilation to the outdoors An exhaust fan that vents to the outdoors The primary reason is ...
manassehkatz-Moving 2 Codidact's user avatar
2 votes

What are these covered ceiling vents in Arizona residence?

Did the house once have a swamp cooler? They put those vents in as a release for the air. When the swamp cooler is running if the humid air has nowhere to escape the house expands and swells like a ...
Stacey Edison's user avatar
2 votes

Bathroom exhaust fan to blow air directly behind it (with no turns)?

Google "mobile home bath fans". There are many different types, some with lights.
RMDman's user avatar
  • 30.9k
2 votes

Is there a ceiling ventilation outlet that can be remote controlled to open and close?

I dug a bit more and found an 'electric exhaust air valve' (German source, datasheet PDF): (not to be confused with such a device for cars, which are also a thing) System voltage 220V/50Hz Current ...
user1908704's user avatar
  • 1,401
2 votes

Is the gap between the sheathing and header on this wall functional?

The plywood for structural sake should be covering up to the top plate. In this case, I think is is either a matter of laziness on the original builders part, or lack of materials. IMO, insulate and ...
Jack's user avatar
  • 35.5k
2 votes

Is it a bad idea to install a bathroom vent in a drop ceiling without external exhaust?

Others already said you shouldn't dump humid air into your ceiling space or other rooms. As for what to do if you don't have a vent that goes outside... There are duct free "exhaust fans" ...
aquaticapetheory's user avatar
2 votes

How to make ceiling vent go around ceiling beam?

Your idea is quite reasonable, and there are round-to-rectangular vent adapters listed at Home Depot and Amazon, for example. you might use two to transition across the beam, and back to round pipe to ...
DrMoishe Pippik's user avatar
2 votes

How to make ceiling vent go around ceiling beam?

Yes, of course. With the constraint you have it might be worth having a local HVAC company build you a custom adapter rather than try to find pre-made ones to suit. You also don't need to go back to ...
Ecnerwal's user avatar
  • 218k
2 votes
Accepted

Installing door seal with MVHR system to prevent noise?

It's probably not a problem. As you said, the door isn't closed but for a short amount of time out of a day. Also, no bathroom door is submarine grade. There's still lots of air slipping through the ...
isherwood's user avatar
  • 139k
1 vote

How to more effectively ventilate a portacabin

A floor level vent will absolutely make a difference. If you're game for a little bit more modification, you can add a roof vent, then make a foam plug for the inside to use when you don't want the ...
KMJ's user avatar
  • 11.8k
1 vote

How to more effectively ventilate a portacabin

It will make a difference. A fan inside the cabin would improve that difference. However, the difference will depend on temperature, wind etc. Also bear in mind that if he is a teen, they tend to be ...
Rohit Gupta's user avatar
  • 6,498
1 vote

Vaulted kitchen ceiling but now have moisture between roof and insulation. Possible cause and remedy?

There should be a 1" gap between the roof sheathing and the insulation. See 806.3 of the IRC. From 806.1, "cross ventilation" means that there is a vent at both ends of every rafter ...
popham's user avatar
  • 10.4k
1 vote

Flatroof DYI vent in a maximum

A single 200mm fan will do just fine to remove heat from your computer case that is 2-3 square feet (and probably no more than 2-3 cubic feet). According to the link you posted one vent will remove ...
FreeMan's user avatar
  • 47.4k
1 vote

Proper Ventilation of a Wet Crawlspace

I would try to mount a small fan in either the closet opening (and blowing into the crawl space), or in the vent on the exterior wall (blowing outward). This will keep crawl space air from migrating ...
SteveSh's user avatar
  • 6,902
1 vote

Can I use a basement oil tank vent pipe to vent a 3d printer enclosure?

Exhausting the air true 3D printer without fresh air supply will create negative pressure in you basement. That would lead to incomplete burn in gas appliances and produce CO.
Traveler's user avatar
  • 17.7k
1 vote

Installing an exhaust fan to attic to cool house

Its an idea that works. There are whole businesses dedicated to this concept. You can also buy kits in hardware stores. They come in various capacities with all the bits including a thermostat and ...
Rohit Gupta's user avatar
  • 6,498
1 vote

Need Help Balancing Attic Ventilation

Your hole area is actually 4 square inches per hole, if we can not quibble about 0.0239 square inches. That is indeed 25.5 square centimeters, with a similar non-quibbling policy. If your insect ...
Ecnerwal's user avatar
  • 218k
1 vote

Is it better to have more, smaller-size soffit vents or fewer, larger-size vents?

Ideally, a continuous vent that allows air to enter each rafter bay is best. Most homes do not have this; rather individual cut vents. The importance is to have intake square footage greater than ...
Evil Elf's user avatar
  • 3,849
1 vote

Is it better to have more, smaller-size soffit vents or fewer, larger-size vents?

More holes spread over a larger distance matters most where moisture control over the entire width of the subroof, in all corners and pockets, is a concern. For heat management, however, the total air ...
P2000's user avatar
  • 16k
1 vote

Does a vaulted ceiling with air gap above insulation require ventilation?

If you have an air gap above the insulation, it must be ventilated. The excess heat must have some place to go. Preferably through a ventilated ridge cap, and continuous soffit vents at the overhangs. ...
Jack's user avatar
  • 35.5k
1 vote

How do I figure out my attic ventilation CFM - california fire safe vents

Basic calculation is based on air exchange's in the room. For that, get the total volume of the attic by square feet multiplied with average height. Once you have the volume divide it by 5 air ...
Traveler's user avatar
  • 17.7k

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