Questions tagged [ventilation]

Use this tag for any situation where fresh air needs to be infiltrated such as while painting or varnishing, drying carpets, etc., to prevent buildup of unsafe gasses including Radon.

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1answer
35 views

How to accurately measure CFM with Digital Anemometer and Duct

We bought a digital anemometer to check the CFM of various fans we have on hand. My husband designed and 3D Printed this duct that securely mounts fans on to the anemometer for accurate readings, ...
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1answer
32 views

In a multi-zone mini-split setup, how do you heat heat rooms without an evaporator?

I recently asked for recommendations for multi-zone heating in a small home (intended for college students). The responses overwhelmingly recommended multi-zone mini split systems. I fully agree, my ...
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38 views

Bathroom ventilation system with electric fan

tl;dr Why am I prohibited from using electric fan in natural / gravitational ventilation system, if there is an additional 2,5 meter long horizontal pipe between ventilated bathroom and the wall? Two ...
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3answers
41 views

Can sewage smell penetrate indoors because of inadequate venting?

I have a basement toilet that is connected to a 4" buried sewer pipe but its vent that goes three stories up to the roof is only 2". The toilet seems to have a permanent smell of urine which starts ...
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2answers
68 views

Is my bath exhaust fan pulling dust into the room?

We moved some time ago and in the new washroom there is a lot of dust on the surfaces (I clean it nearly every day but next day there is a new layer). Only source I could imagine is the ventilation ...
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1answer
78 views

Is this an alternate vent connection for my clothes dryer or does it serve another purpose?

I have gas clothes dryer in my new home. Behind the dryer you can see metal conduit for exhaust and gas intake and this seems to be where things are hooked up. Above the dryer, on the wall is a 4" ...
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55 views

Can I leave one side of my metal frame dry half wall open for appliance ventilation?

I am installing an indoor metal frame half wall that will hold a countertop in a bar. The The wall is L shaped and anchored on concrete and against a wall at the top of the 'L'. The long part of the '...
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1answer
33 views

Using a HRV/ERV Fan without mounting it on a wall/window?

DIYers, I'm considering various options for home improvement and improving the home economy and resource/climate efficiency. One area of focus is the fact that I live in Denmark and it can get quite ...
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1answer
59 views

High humidity in bedroom and condensation

I have a Bungalow build 1950s cavity walls not sure if they have insulation in the cavity. Suffering from really high humidity in main bedroom 74% overnight dropping to 59/60 in day. Window and ...
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2answers
46 views

Should I modify the end trusses to accomodate a gable vent?

I am currently building a detached, single car garage and getting ready to sheath the roof. I had originally specified a ridge vent but am strongly considering switching to a gable vent. I have some ...
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1answer
80 views

Range Hood Ventilation - Working around a stud

I need to install a simple under the cabinet range hood with ventilation to the outside. Of course, there is a stud blocking the easy horizontal path to the adjacent exterior wall. I suppose I could ...
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2answers
1k views

Bathroom fan fluctuates in power when using countdown timer switch

I just installed this new fan in the bathroom: Utilitech Ventilation Fan 1.5-Sone 100-CFM White Bathroom Fan However, if I use regular toggle switch, it works fine. But if I use countdown timer ...
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2answers
42 views

Ventilation when using water-based stain & finish

With oil-based stains and finishes, reading SDS safety sheets makes it clear that safely using the products requires nitrile gloves, serious ventilation, and a respirator that can handle VOCs. With ...
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1answer
42 views

Any structural issues when creating an 11" diameter hole in brick wall?

I'd like to install an external blower for a range hood. Spec says an 11" diameter. I have a 12" thick brick wall. I'm wondering if there are any structural issues with making a hole that big. The ...
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2answers
64 views

How do I attach a new pipe to this vertical ABS pipe?

I have this vertical air exhaust pipe in my attic and I want to feed more things into it. What is the best way to attach more pipes to it? Can I cut a hole into the side with a hole saw, put in the ...
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1answer
29 views

How does one properly seal a celling vent of a forced air hvac system?

In a room that may have had some kind of condensation on the past, how should one go about sealing the area around the vent hole in the ceiling, specifically to reduce the likelihood of returning ...
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1answer
70 views

How should I decide between an HRV and ERV for a northern climate home?

I have a 33 years old house in Bedford, Nova Scotia, Canada. The existing air exchanger is out of order and need to replace with something newer. Question is should I get a HRV or ERV system. As I ...
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82 views

how to stop the smell of cigarette from other units coming into our bathroom air vent

Few months ago, I bought a unit in a new mid-rise condominium and we live on the top floor. When the owner of the units below me moved in after 2 months, I started to smell cigarette smoke in our ...
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1answer
39 views

Using larger pipe for range hood

My new range hood calls for 5" pipe. I was planning to use a 5"/6" reducer to convert to 6" pipe for going through my attic to the roof. I know that using a smaller pipe than what is called for is ...
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2answers
94 views

Periscope dryer vent in exterior wall

Our exterior wall has 2x4 framing and we wanted to see if we can run a periscope vent for the dryer in the exterior wall before venting out. We are trying to save some space in the laundry area so ...
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1answer
96 views

Can I remove this mold by myself?

I am living in a single room-appartment that has one window, a kitchen unit with no steam outlet/exhaust hood, and a bathroom with no windows but an (albeit small) ventilated outlet above the shower. ...
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2answers
134 views

How can I attach/seal around an exhaust fan duct at the roof?

I am redoing the ducting from a kitchen exhaust fan to the roof cap. The old ducting was 6" and I'm increasing it to 8" to match the vent on the new exhaust fan. The current roof penetration is a 6....
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2answers
48 views

Would an opening to the outside help me dry out a basement?

I had a hot tub problem which resulted in huge amounts of water gushing out into the yard. This happened a couple of times. (Hot tub repair company from hell.) The hot tub is situated a few feet ...
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4answers
100 views

Why do all shower cubicles have open tops, and does it have to be this way?

I have a small bathroom with a traditional 2 sided shower cubicle in one corner. Like all shower cubicles it has an open top. The bathroom has both an opening window and a working extractor fan. If ...
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5answers
167 views

AC is dead, should we open the windows to release the heat and humidity?

Live in Central Texas where the temp is in the upper 90's, low 100's. My AC went so I had to put a single room AC unit for my Master bedroom and bath. Square footage for coverage is 600 sq. feet. Well,...
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2answers
60 views

What are the requirements for a bathtub or steam shower in a bedroom?

We live in a suburb of Minneapolis. Our master bedroom has a decent amount of unused space. My wife really wants a steam shower. Rather than remodeling an existing bathroom, I've started thinking ...
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1answer
45 views

Adding ventilation to an older outbuilding

I have a large to me storage building that I am trying to convert into a garage/workshop. I don't have the time/money/inclination to tear the whole thing down and start anew so I am trying to make ...
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3answers
55 views

Bathroom Fan/Light Combo

I am installing a new Bathroom Fan/Light combo to replace an older unit. The new one comes with 5 connections - 2 black and 2 white (one of each labeled fan and light) plus a ground. My wiring has ...
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1answer
50 views

Axial or centrifugal fan for short run out of kitchen?

I'm researching replacements for a broken extractor fan in my kitchen. It is wall mounted and runs through the wall straight outside, no long ducting involved. The current (broken) fan is the ...
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1answer
51 views

How important is soffit ventilation with tiled roofs?

While attempting to install a security camera in the soffit of my bungalow home, I noticed that there is wood paneling beneath (above) the soffit. The soffits are aluminum, and it looks as though ...
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1answer
31 views

Proper Trap Diameter

My kitchen sink drains slowly even after I snaked it 20ft without hitting any consequential clogs. I'm thinking there could be a couple of issues: The trap diameter (2.5") is too wide for the inlet ...
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14 views

water in insulation boards - best method to dry out

I have a horizontal flow brand-new HVAC unit, with a 1" thick insulation board plenum which has had some water ingestion on the bottom panel. The unit is in the attic. I'm quite confident the water ...
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0answers
23 views

Garage gable fan through truss

I'm looking to install a ventilation fan in my garage. I want to install it in the middle (mainly for looks) rather than having it offset to one side or the other. Am I OK to cut through the middle ...
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26 views

Moisture Control/Ventilation with Cathedral style Roof

I'm in New Zealand, I have recently bought a house with a Cathedral style roof, that in the morning gets a log of Condensation on the Windows etc. Once the day gets going, the house does catch the sun ...
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78 views

Is this awkward dryer exhaust plan manageable?

I'd like to replace my 90's era washer/dryer with a modern one, but my space constraints are very strict. I can't get a dryer that sticks out any further from the wall than my current one, which is 25....
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29 views

Rough in bathroom exhaust

So, I have a pretty basic question that I can't really figure out for some reason. Is there a way to rough in bathroom exhaust fans before siding? In other words, there are trim kits for sconces, ...
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2answers
276 views

Can I vent a portable air conditioner unit through a heat vent?

I have an old house and don't have a window to open for the portable AC to vent to. Can I vent it out through a heat vent (my home has modern ventilation)?
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27 views

Diagnose poorly functioning whole house fan

I installed an AirScape3.5e whole house fan. I don't think the fan is operating at its max potential. It just doesn't seem to cool the house down very much when running even when the outdoor ...
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377 views

Open cell spray foam off gassing 2 years later. How to fix?

My home was built in 2017 and has Accella open cell spray foam in the unvented attic. In spring & summer 2018 we noticed a mild chemical smell coming from the attic on hot and/or humid days. It ...
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1answer
73 views

range hood confusion

I am making some changes in a somewhat older kitchen. Part of this is replacing the stove with a 30" dual fuel (LP) range but keeping the existing 300 CFM fan. I was all set to buy a professional ...
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2answers
33 views

What type of exhaust ventilation is best for attic?

We want to add exhaust ventilation to our attic (hip-style composition roof). Which type is most effective, passive or power?
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0answers
322 views

Can a bathroom fan go out a ridge vent, and how functional is this temporary fix?

I'm in a 1 story craftsman house and have a bathroom vent that had no ductwork, just pouring wet air into the attic. The vent also didn't work well to begin with so we never used it and thankfully ...
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2answers
52 views

Can I leave an unused conductor when running wire for an extractor fan?

Whilst wiring a new extractor fan, I’ve ran out of twin and earth but I have some left over three core and earth from the lighting (1mm^2). The fan doesn't have an over-run and only requires 2+e. It ...
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1answer
185 views

DIY cold room ventilation

I live in Southwestern Ontario (seasonal temps of around -5°c in the winter, around 30°c in the summer) and I would like to build a cold room in my basement. The basement is unfinished with poured ...
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6answers
332 views

Letting fresh air through a window without letting noise in

I live in an apartment and it's pretty noisy outside, so I usually keep my windows closed. It does get pretty stuffy inside though, so I'm wondering if there's a way to get air through the window ...
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1answer
1k views

Putting a microwave in an island?

We are remodeling our kitchen, and we are going to put the microwave inside of our new island, Below the counter top, Built-in with the cabinets. Our old microwave is an "over the range" microwave ...
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2answers
59 views

Should I be concerned about ventilation in a small room?

I have a 10'x10' room in my garage that I use as a drum set practice room. I've been sealing it up better to provide some sound proofing. The sealing is not extreme, but I have an exterior door (like ...
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1answer
55 views

What is this tiny ventilation mechanism in my window frame and how do I replace it?

I live in a building with wooden double-glazed window frames and have this tiny "ventilation" outlet installed into one of the larger windows in our apartment (see below). What is its purpose, and ...
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2answers
424 views

Should I keep attic gable windows open for ventilation?

Our attic only has a ridge vent (no soffits). It also has two windows on either end. It was recommended that we keep them open to help ventilate the attic. Is this a good recommendation? Should we ...
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1answer
40 views

Wall grille that fits one step stair

Between my dining room and living room upstair area, there is one step down and there is a wall grille that is 5.5" tall. What drives me nut is there is no 14x5.5 grille anywhere. There is either ...

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