For questions generally relating to the exhaust ventilation of air from inside the home, and/or methods to promote proper airflow thorough various spaces in a structure.

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2
votes
1answer
997 views

Do I need soffit vents for my knee wall attic?

I purchased a 55 year old home that has no soffit vents. The attic space consists of a knee wall attic space and peak attic space. The peak attic space has vents at each end and a ridge vent at the ...
7
votes
1answer
3k views

How can I catch more lint in my dryer?

In the 3 story townhouse I'm currently in, the contractor originally built the (stackable) dryer vent to go straight up from it's location (top floor), then when it gets above the ceiling, it angles ...
5
votes
2answers
732 views

What kind of vent is pictured here and what are its uses?

While my roof was being replaced, I requested that they install two roof vents. One for laundry and one for bathroom fan. They installed two of these. I just tried connecting the bathroom fan to this ...
6
votes
1answer
4k views

How can I lengthen my vent stack and are there any negative effects in doing so?

I have observed that when we receive a lot of snow here in Ontario, at least one of the drain vents on my roof is covered by snow. While after one winter in the house I have not yet observed any ...
3
votes
2answers
530 views

Bathroom air vent drip

I have a constant drip coming from the air vent in my downstairs bathroom. After one week it has filled a bucket full of water. There has been no snow or rain in my area. The air conditioning hasn't ...
5
votes
1answer
9k views

How can I properly vent a basement toilet & shower using an AAV?

When we bought our house the plumbing drains for a basement bathroom were roughed in but they did not install any vent lines for them. We have the first floor plumbing draining into the main stack ...
9
votes
4answers
30k views

What is the purpose of a bathroom exhaust fan?

Okay I actually do understand the purpose of the bathroom fan; it gets the steam out of the bathroom after a super hot shower, right? Well turns out I NEVER turn it on. I suppose I don't shower in ...
1
vote
1answer
492 views

How can I vent a range hood that's not on an exterior wall?

I want to vent a range hood out and it is not on an outside wall. I have already installed 12X3.5 duct into the attic through the cabinet and ceiling (visable). the 90 turn and wall cap are 10X3.5. ...
3
votes
1answer
1k views

How can I reduce whistling due to wind across a gas fireplace vent?

We have a gas fireplace venting through the roof of our attic bedroom; there's a cap on a chimney up there. Double-wall construction, such that it pulls combustion air in from outside. When the wind ...
8
votes
2answers
12k views

What are my options for venting a bathroom exhaust fan?

I would like to install a fan in our bathroom which currently has none. However, I'm very confused regarding the best approach for this. Above the bathroom is an attic space. I have read that ...
3
votes
1answer
589 views

How should I go about fixing a holey laundry room?

When I removed some old elevated cabinetry in my laundry room, I discovered two holes in the wall. The first I documented here, How do I close and seal an old external vent? and the second can be ...
3
votes
1answer
1k views

What are some alternatives to a square ceiling air diffuser?

We recently bought a house that had an addition put on in the 80's. The addition is on the back of the house and has separate (electric) heating and cooling. In the ceiling are two square, 12.75" air ...
6
votes
2answers
4k views

Do I need soffit vents when I have 2 gable vents and 5 normal peak vents?

We are in southeast Idaho, have a plain simple gable roof on a 1,050 square foot floor house; the roof's pitch is not great, probably 3 or 4/12 but normal for our area. We have 1 vent at each gable ...
1
vote
1answer
1k views

How can I modify this dryer vent cap to keep lint from getting trapped?

As mentioned in this question I installed this dryer vent cap on my roof As you can see, there is a gap between the flashing and the cap, presumably to let water out if it gets in. This is ...
2
votes
1answer
2k views

Moving my washer and dryer will mean I'll need to move my dryer exhaust vent. How should I go about this?

I live in a two-story condo/townhouse. My dryer is downstairs in the kitchen and I'd like to move it upstairs. Right now, the exhaust vent runs up through the wall and under the upstairs bedroom ...
5
votes
2answers
17k views

Maximum run on drain?

I'm planning a reconfiguration of my basement and want to move both the powder room and w/d to new locations. The powder room would be close enough to the stack not to worry me, but I'm looking at ...
5
votes
1answer
997 views

How can I vent this dryer?

I am installing a mini washer/dryer into a second story bathroom. I want it to be the safest and easiest installation that I can do myself. I understand the basics: minimum 4" diameter tube. Use ...
1
vote
0answers
619 views

How do I ventilate a bathroom through a small window?

I've got a very small bathroom without a vent fan. Since it is in a condo among a lot of others in a large building, a standard vent fan cannot be installed. However, I do have a small window and was ...
5
votes
2answers
2k views

Bathroom vent terminates to attic not outside.

Bathroom vents terminates to attic. The Inspector recommended that it terminates to the outside. What is the best way to do this. Should I just place the bathroom vent next to the roof vent opening. ...
4
votes
1answer
2k views

Attic ventilation - intake:exhaust ratio vs total ventilation area?

I have decided to go ahead and install a ridge vent in my house. The only current attic ventilation is soffit venting on one side of the house. As part of this project, I am attempting to determine ...
5
votes
2answers
5k views

HVAC vents - does wall or ceiling mount matter?

I'm going to add some crown moulding to some bedrooms. I've got HVAC vents mounted near the top of the wall and the moulding will cover part of the vent. I want to move the vents out of the way. I ...
2
votes
3answers
15k views

How to make a 6 inch hole through a brick wall for venting

I'd like to vent my range hood out through an exterior brick wall. How would I go about making a 6 inch hole for the vent? I'd guess I'd use a masonry chisel to chip out the mortar and then pull ...
5
votes
2answers
1k views

Is the open grate in the ceiling between my garage and attic necessary?

I have a plastic grate in the ceiling of my garage that simply provides airflow between the garage and the attic. Due to the layout of my garage, my workbench is almost directly beneath this grate. ...
5
votes
2answers
4k views

Installing bathroom exhaust fan: what to do with vapour barrier and insulation?

I'm adding a bathroom exhaust fan, which is being mounted in the ceiling of the bathroom (in the attic) and venting out through a vent in the wall. right now, there is a vapour barrier (paper) ...
2
votes
1answer
292 views

Forced air heating air inlet in crawl space

The air inlet for my electric forced air heating is a small vent on the duct in the crawl space. Although the crawl space is sealed with a concrete floor and heated (ie insulation is around the ...
2
votes
1answer
370 views

How do I deciding whether to install an attic venting system?

I live in Colorado, and the weather is starting to warm up. In a couple months, the temperatures will rise pretty high. Thankfully, I have a well insulated house (there is over 20 inches of fiberglass ...
9
votes
7answers
14k views

What is the best way to clean your clothes dryer exhaust?

My dryer exhaust goes out of my laundry room, into my attic, and runs for about 15 feet before it gets outside. Over time the lent has built up quite a bit. What is the best way to clean this? The ...
1
vote
2answers
764 views

What bathroom vents/ceiling/roof vents and fans are most recommended?

I need to vent a room in an uninsulated cabin - the ceiling is also the roof - so I don't need soffit tubing or anything like that. I am looking for a fairly cheap item that has a large cfm ability. ...
2
votes
1answer
2k views

How to properly vent attic in windy/snowy areas to avoid snow infiltration?

To ask the other part of question: How bad is it to have wet insulation? that didn't get asked... How do you deal with homes that are in high wind and snowy areas which are susceptible to snow ...
1
vote
2answers
5k views

How do I connect a dryer to a dryer vent?

I just moved my dryer (gas) a couple feet to a better location in the basement. It is actually now closer to the existing dryer vent to the outside of the house. The previous owner has it connected ...
6
votes
1answer
616 views

Venting the attic space during summer to cool the house

The air in my attic gets superheated during summer, from the sun baking the (clay? terracotta?) roof tiles (I live in Sydney, Australia). I have good ceiling insulation, and even put in some sarking ...
1
vote
4answers
3k views

Are there efficient ways to provide combustion air to heating appliances?

In a previous question we established that there probably should be a vent between my utility room (which opens into the kitchen and living space in general) and the outdoors (in my case the attic, ...
7
votes
2answers
914 views

Is there any legitimate reason to have a direct vent between utility room and attic?

I've been doing some sealing and insulating in my attic, and discovered a purpose built vent directly from the utility room into the attic space. See most of these photos The house is in a ...
2
votes
3answers
7k views

Can I vent a microwave vent / range hood through wall?

I've got a Whirlpool over-the-range microwave that is currently venting back into the kitchen. I'd like to poke a hole through the wall and vent it directly outside. I've read the instructions and ...
3
votes
1answer
388 views

Bathroom Vent is tied to ceiling vent in adjacent room

I live in a bungalow with a bathroom on both levels. The bathrooms both have exhaust vents. Outside of each bathroom is a ceiling vent. The previous owner stuck towels in these to block them off. ...
7
votes
2answers
259 views

How to fit vents in a roof

The home we have just brought has no vents in its tiled roof; therefore it is getting a lot of condensation in the loft. So how do I fit vents? Do the vent you fix from the inside (rather than ...
7
votes
4answers
13k views

Why is one bedroom always colder than the rest of the house?

We have a two story home with 3 bedrooms upstairs. Home is 7 years old. One of the bedrooms is always around 5-6 degrees Fahrenheit colder than the rest of the house (when compared to the thermostat ...
3
votes
4answers
4k views

How do I close and seal an old external vent?

I was removing some ancient hanging cabinets in my small laundry room when I found an old vent of some kind. It had been completely hidden behind the old cabinetry. My dryer vents out through the roof ...
5
votes
3answers
1k views

Can I close the garage vent on my furnace?

My furnace duct system has a vent in the garage, right over the furnace. Is it necessary for the proper operation of the furnace to keep that open? I'd hate to waste the money heating up my garage, ...
8
votes
2answers
11k views

What are the pros and cons of soffit vents vs. roof vents?

During my latest foray into the attic, I discovered that my bathroom exhaust fans vent directly into the attic. I'm worried about moisture buildup and I'm considering routing the exhaust to an ...
5
votes
2answers
2k views

What should I consider when cutting a dryer vent hole?

Our dryer has been taking forever to dry loads so, this morning, I disassembled the vent pipe and scrubbed out all the lint. However, before reassembling the vent, I had an idea. The current vent run ...
3
votes
4answers
2k views

Should I drill a large hole through a double paned window?

I have a laundry room in the basement. There is no exhaust vent for the dryer. Currently we just open the window when drying, but this is not the greatest solution. There is a window and it is ...
3
votes
1answer
596 views

Can I use a 1 1/2 vent for a toilet (3" drain) in CA (not a went vent, no other fixtures on it)?

Most of the info I have on code implies this would be OK, but one item I have says that a 1 1/2 vent can only serve 8 "non-WC" fixture units.
8
votes
2answers
7k views

How do I install a sink in a room that doesn't have a drain vent?

I want to install a sink in my attached garage where there is no existing plumbing. I will be running new water supply and drain pipes to mains behind a nearby wall. I'm concerned I will need a ...
2
votes
2answers
3k views

Should I vent my kitchen range vertically or horizontally?

In a planned kitchen remodel, one upgrade is to install an outside vented range hood. My choices are to vent vertically up through the roof or up and then horizontally (8') out the kitchen wall. The ...
1
vote
2answers
776 views

Can I vent a dryer from the same mechanical closet as a water heater.?

I'm currently looking at a condo to purchase and the existing "closet" that contains the plumbing and venting for a washer/dryer is a bit on the small side. It's probably not that big of a renovation ...
3
votes
3answers
473 views

How to best clean the inlet vent screen on a microhood?

Over the years, my microhood has developed a greasy buildup in the inlet vent screens on the underside of the microhood. They're an aluminum mesh that comes out easily with a label near it saying not ...
2
votes
1answer
169 views

What kind of screws for crawl space vents?

I'm removing one of the ancient crawl-space vents from my house in order to put in a wiring pass-thru plate. The old vent only had a couple screws on it and the new plate has a lot more holes... So, ...
4
votes
1answer
2k views

How do I add a quiet blower or fan to a gas fireplace?

I have beautiful fireplace in my family room, although it is gas rather than wood burning, and it vents strait outside. Due to the nature of how it is vented, I don't really get much heat from it, and ...
10
votes
9answers
13k views

Do thermostat-controlled, auto-adjust HVAC vents exist?

The residential forced-air HVAC systems I have seen are controlled by a single thermostat in one room. One has to manually adjust the vents in order to adjust the temperature in other rooms. Is ...