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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Do old vents need to be removed if ridge vent is installed?

With a new ridge vent installed, I am wondering if these old vents need to be removed? They're plastic covers over a square hole cut in to the attic plywood. Just curious if it will interfere with ...
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2 votes
1 answer
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Do I need a new roof to install ridge vents?

I wanted to have a ridge vent installed across the top of my roof to improve ventilation. Roof is about 40ft long with a ridge board in the middle and 5/12 pitch. Roofer came out saying he can't ...
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Using gable vent inside roof ventilation system

I have three powered roof vents and all three went bad within two months of each other. Wanted to replace the motor from attic side but, just about impossible to take fan blades off without bending ...
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What To Cover Hole With

I had a room remodeled and added a sink, the pipe that connects to the sewage line for drainage runs straight up into the wall and my drywall guy said to call a plumber to get them to add the ...
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Sealing air gaps around edges of attic gable fan

I just installed a new gable fan to exhaust hot air from my attic. Due to unevenness in my studs and gravity pulling one side of the fan lower than the other, there are small gaps (ranging between 1/8&...
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Insulating a wooden shed to provide strong heat rejection

I'm getting a large new shed built in my garden and I'd like to insulate it to make it a bit more comfortable to work in. The shed comes with stud framework on the walls, so my plan is to use OSB to ...
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Moisture in bay window bench seat

I live in a 1940s house with uninsulated double brick wythe exterior walls. The interior wythe has some kind of masonry skim coat. The front wall of the house has a bay window. Last spring, I built a ...
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5 votes
2 answers
727 views

CFM Required to Ventilate Room to Maintain Temperature

I am designing a computer room inside my home. The room walls are inside the house. This question excludes floor, wall, and ceiling losses/gains. I am looking for the formula to calculate the CFM ...
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1 answer
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Do I have a moisture problem with my soffit?

Looking underneath my gutter, I noticed that the soffit is a bit discolored looking. Looks kind of like mildew or moisture marks. Does this just need some tender-loving-care or do I have a more ...
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Range hood with worrisome ventilation set up in Hong Kong

I just took a new apartment in Hong Kong where I didn't notice the way the stove ventilation was set up. The landlord used a discount department store contractor who installed the Siemens range hood ...
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DIY power connection to ventilation unit

I bought a ventilation unit that came with a bit more DYI required than anticipated since I'm a complete noob when it comes to electrical stuff. I have a picture of the unit itself, the power ...
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1 vote
1 answer
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Is there a minimum distance between two exhaust vents going out an exterior wall? (NJ state)

Is there a minimum distance between two exhaust vents going out an exterior wall? I'm in the state of New Jersey and I was unable to find anything related to minimum distance between two exhaust vents ...
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1 answer
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Best position for kitchen exhaust duct flow sensor

*TL;DR: a flow sensor on a kitchen exhaust duct fails to work reliably in its current location. Will moving it down two floors closer to the upstream exhaust hoods help or be a waste of effort? We ...
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Downstairs WC cold - Extractor or windows?

I have a new build and of course there will be a few niggles here and there, however one of the biggest gripes is that the downstairs WC (toilet) feels chilly when compared with the hallway just the ...
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Wiring a damper to an erv

HVAC installer didn't put a mechanical damper in the fresh air supply line, so I get cold air Back feeding. The erv 24v line is hooked to my thermostat. Do I hook the 24v damper to the same line or? ...
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3 answers
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Extractor fan or dehumidifier?

My home has a consistent high relative humidity (70-90%, depending on whether I am hanging clothes to dry as I don't have a dryer) during winter. Thankfully, it seems that enough ventilation is ...
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Dust accumulation & air flow with partially open vs fully closed door

My parents always tell me if I should keep my door partially open as in "closed" but not locked into the frame. However, my door has a line of space under it which would technically allow ...
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Under stairs stale air/damp/mold smell

We have a stale air/damp/mould smell coming from the under stairs cupboard which you can smell around the ground floor area. The floor boards aren't damp, neither is the wood of the stairs from below. ...
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8 votes
2 answers
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How does ventilation help in a detached garage

I just bought a house that has a HUGE detached garage. The problem is that there is NO air movement at all. It ends up smelling really musty and some of the items inside seem damp. A friend ...
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6 votes
3 answers
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Should I install soffit or gable venting with a 3:12 pitch roof?

Been trying to find a reputable and concrete answer as to what type of ventilation we should use on our ranch house that has a 3/12 pitch shingled roof. The house is located in the Cincinnati Ohio ...
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1 answer
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What is the purpose of boiler damper?

Gas hydronic boilers usually have a mechanically controlled damper along the way of its ventilation stack, typically near the appliance itself, for proximity of electrical connection. Is their only ...
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Hydronic boiler flue ventilation

My gas hydronic boiler is designed (or just specified) to require a draft hood and a damper on its 6" flue. My question is, on a level lower that going by the dictates of the spec, how much less ...
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swapping direction of two vents

Doing a bathroom remodel. There are two wall vents involved. One faces into the bathroom and the other faces out to a dressing area. They are on either side of the doorway. I want to change the hinged ...
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Ventilating utility room with gas appliances

I have a 20 sq ft utility room hosting a water heater and hydronic boiler, both gas. The door to the room is louvered, to allow for air passage. In addition to that, I was wondering if installing air ...
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Mechanical Ventilation filters: DIY with bulk material

My home has a mechanical ventilation / heat recovery system (this one) with two filters that have to be changed at least every six months. I've seen that they quickly become dirty and clogged with ...
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Increasing air intake in the attic to prevent ice buildup on the roof during winter

We bought a townhouse in 2018 in a Canadian city where we have frequent snowfall during winter. Here are pictures of the back and front of the house. In the last two years, we have had ice dams on ...
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How do I make a round hole in overlapping cement board wall with limited access?

I am having a hard time planning a hole for a one room in wall ventilator. I have already a 160mm hole in my exterior wall. However, on the outside the wall is covered in 3-mm square cement board ...
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Should I trim my bathroom door to improve air extraction?

Current situation My bathroom looks like this: The problem is that I face some mild humidity issues (on ceiling and tile grout), as it is difficult to extract air after having taken a shower. Indeed, ...
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1 vote
2 answers
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Excessive Dust in All Rooms - Could Ventilation Unit Cause This?

We have recently moved into a first floor apartment in a new building that is approximately 9 months old. We are finding that we are absolutely plagued by a constant layer of dust building up in each ...
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1 vote
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How much garage ventilation is necessary?

The Background I have a 2-car, attached garage with additional shop space. The garage area is roughly 19x21 while the shop space is roughly 12x27 for a total of ~725 sq ft. See the very not to scale ...
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How can I seal an air vent on an exterior bedroom wall?

I have this vent into a bedroom in a flat I am renovating. This room can get quite drafty, especially in winter and I'd like it to comfortably be a bedroom. Is there any way I can seal it up or put in ...
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Need help with poor attic ventilation

My son's attic is running about ~30 deg hotter than the outside temp in the peak of day and makes the AC work overtime to cool the house. The previous owner re-did the attic/roof, and there are only ...
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1 vote
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Can I put a box fan in a chimney to help circulate out hot summer air?

I have a classic brick chimney for a wood fireplace only (i.e. no hot water tank or other things sharing the stack). In peak summer heat, the interior of the upstairs is well above the exterior ...
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5 votes
1 answer
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What's the most effective way to further reduce attic temperatures in hot weather?

I just bought a house 6 months ago. Early on I discovered the not only was the attic poorly insulated, but it was not properly ventilated. The 1000 sq ft attic had 1 blocked soffit vents in each ...
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-1 votes
3 answers
162 views

How can I get my building owner to deal with a mold issue?

I live in an apartment with no ventilation to the outside. The bathroom fan is ductless as is the range fan in my Kitchen. I have a mold issue in the apartment due to the lack of proper ventilation ...
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1 vote
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How to fit portable air conditioner hoses through a too small wall vent

Our apartment doesn't have A/C, but we do have wall ports for a portable A/C unit. Unfortunately, I can't really fathom how I'm supposed to hook the hoses up to the wall vents. As you can see, the ...
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1 vote
2 answers
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Will an extractor fan increase air flow when the room already has permanent openings to outside?

I have a bathroom 2.5m X 1.8m X 3.5m ceiling. On one wall at 2.4m off the ground there is approximately 0.9m X 0.4m ventilation frame, which is covered in metal mosquito mesh. There is a further 0.8 X ...
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How do I shorten pre-installed ducts without cutting into the ceiling?

Upgrading a bathroom fan and I need room to convert a 3" duct to a 4" flapper on the fan (about 7" of length overall). The ductwork is rigid sheet metal and ran directly to the old fan. ...
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Is it okay that I taped over ventilation outlets?

I live in a building where I have no control over ventilation, it is very loud and annoying, the smell from othe people rooms and cooking is coming inside my room, together with the awful amount of ...
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1 vote
1 answer
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Small 1940s colonial with no soffits, no eaves, two gables and needs ventilation

I have a 1940s colonial with no eaves, no soffits, and soffits can't be added. I do have two gable vents (original) and a power fan that was added (but is broken). I have early stage mold. The diagram ...
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Fresh Air Ventilation Humidity Issues

We moved in a few months ago to a new construction home and had noticed very high humidity inside our house, sometimes about 70-80%. When moving in the builders explained to us about the fresh air ...
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1 vote
1 answer
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Is it safe to have a heating vent covered by a gas range/oven

I moved into a house where I discovered the central air floor vent is directly under a freestanding gas range/oven. I can feel the forced air coming through the burners. Since it's a slab foundation ...
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1 vote
1 answer
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Does the wall termination vent for a kitchen range hood need fastened to the duct tightly?

6" duct running out through exterior wall. For my dryer wall vent, I used a pipe clamp to tightly secure the round duct around the outside of the male fitting on the wall vent. I have access to ...
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0 votes
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Help – keep garage dry and well-ventilated (dryer exhaust hose)

I just got an old car and need to keep my garage dry and well-ventilated. Right now my biggest problem is that I have about 3 feet of 4-inch dryer exhaust hose going from my laundry room to a hole ...
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Breathable Membrane Tyvek

Log Cabin - Would i have moisture issues if i attach a breathable membrane to the outside studded wall leaving a 20mm gap for moisture then attach treated 44mm tongue and groove on the outside. I ...
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2 votes
1 answer
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Using a bathroom fan with a smaller duct - is there a minimum size?

I am looking for information on how to properly replace a bathroom fan which is not working well enough (probably insufficient CFM). The bathroom fan I need to replace is a 90mm fan rated for 65m3/h (...
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3 votes
2 answers
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Can I vent portable air conditioner into the garage?

I have a bonus space that is attached to the garage that we use as a home gym. I want to be able to run a portable air condition when working out. It will only run 2-3 hours a day and probably only ...
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How to safely wire this non-invasive solution as a smart three-way perilex switch for a heat recovery installation?

I have been wondering about a solution to this for long so I've decided to ask it here. I'm a programmer, not an electrician but I know how to properly solder things and generally how to work safely ...
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1 vote
1 answer
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How do I open a fresh air vent only when the HVAC system is on?

An unusual problem for sure and my HVAC contractor (or anyone else in the business) has not been able to figure out a solution. I thought I would reach out to a larger group of experts that may know a ...
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1 vote
0 answers
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Open Space with Hot Roof, best ventilation?

I just purchased a home in Minnesota, the house came with a detached garage with a living space above that we want to make livable. The lower-level is partially buried below grade. The picture ...
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