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
29 views

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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1answer
53 views

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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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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3answers
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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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1answer
37 views

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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14 views

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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22 views

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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25 views

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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43 views

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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46 views

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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56 views

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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1answer
55 views

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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2answers
57 views

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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80 views

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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2answers
45 views

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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41 views

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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1answer
91 views

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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1answer
164 views

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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3answers
161 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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2answers
124 views

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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2answers
37 views

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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32 views

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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2answers
126 views

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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1answer
108 views

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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37 views

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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1answer
29 views

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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1answer
41 views

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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30 views

Mold on cedar siding

Bungalow style home in Milwaukee WI with finished attic. Can access the Southern portion of the attic,via a crawl space,but not the opposite side. We had ice dams this winter and there is mold on the ...
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1answer
51 views

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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0answers
17 views

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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1answer
138 views

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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2answers
496 views

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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2answers
189 views

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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1answer
60 views

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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0answers
26 views

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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3answers
69 views

Safety of "Safe" Solvents

I put off stripping the paint of my interior trim until the winter, since there were so many more pleasant outdoor tasks during the warmer months. Now that it's time to fish or cut bait, I'm thinking ...
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0answers
35 views

Upper Floor Window Condensation Issues - HRV?

We live in a 2 level home with basement in central washington. The winters average 20-36 degrees Fahrenheit with humidity levels of 70-99%. Summers are fairly warm to hot with lower RH. Our issue is ...
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1answer
45 views

How do I provide proper venting for a single exhaust portable AC unit?

Ever since I got my portable AC, I've been wondering how I can make this hunk of junk more efficient because till this day, I have never been able to drop the temperature lower than 25° C. This week I ...
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2answers
163 views

Wall damage from insufficient attic ventilation

The wall in my master bedroom, which is facing outside, has exposed brick and, for several years now the bricks have been showing signs of moisture damage. The symptom is white, frost-like substance ...
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0answers
37 views

Help to identify sound in bathroom

I have a manufactured home. I hear a sound that resembles a wooden ball dropping on a hard surface, it seems to bounce as well, sometimes multiple times a day. It sounds like a croquet ball bouncing ...
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1answer
123 views

Right-Angle Adapters and Plug for Air Conditioner Exhaust

Full picture of AC with exhaust tube. Exhaust port through window. As shown, I have an air conditioner which has an exhaust hose which moves out hot air through the window and outside. I did a ...
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1answer
93 views

Air intake for a condo apartment

I am renovating a top-floor apartment (gutted it entirely & rebuilding everything). With new windows and doors, spray foam insulation etc, the space is becoming quite air-tight. I will be putting ...
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1answer
40 views

Should I clean my boiler room duct (ventilation)?

Our boiler room in our house is in our half above/half below ground basement. We have a new 100,000 BTU boiler that was installed last year. We also have a gas hot water heater next to it. In the ...
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0answers
68 views

How to merge extractor fan ducting

I have an kitchen extractor hood that vents air through a 5-inch flexible ducting to a louvred cover in the outside wall. I'd like to add a similar piece of ducting to vent the tumble dryer outside, ...
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2answers
62 views

3-way switch to control 2 fans independently

I have a room where I need 2 ventilation fans. One will be a regular bathroom fan, the other a much smaller fan powered through a timer in an outlet. Both will be vented through the same duct to the ...
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1answer
197 views

Can I install a ridge vent on simple truss shed roof (no ridge beam)?

I am building an 8x12 shed and leaning toward a ridge vent/soffit vents for my ventilation. The gable vents won't really work with the aesthetic on the sides. I'm building simple trusses using 2x4s ...
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0answers
27 views

Ventilating a flat roof

My ensuite bathroom has a major humidity problem. I took the fan out (it's one of those combo heat lamp + light + fan units) expecting the fan to be broken, but found another problem - it's just ...
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1answer
327 views

Ventilating a cat box through the dryer exhaust duct

I have a small closet that doubles as a laundry room, with a stacked washer and dryer. It's also where I keep my cat's litter box. It occurred to me that I could probably reduce the odor of the litter ...
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4answers
232 views

Can I keep mold out of wet rags?

I am cleaning windows (small business) and that generates a bag of wet dirty cotton towel rags each day. I wash the rags each day, and need to store those until the end of the week, when I take the ...
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0answers
132 views

Two vents in utility room, one to AC one directly to attic where hot moist air comes from?

I have a question about my AC system/attic/laundry room. This is a new house built in 2019. Been living here for a year. I Noticed the laundry room has always been humid and figured it was because of ...

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