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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14 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
31 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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236 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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124 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
25 views

Fresh Air Vent to run only when 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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24 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
64 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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27 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
20 views

Venting for a single exhaust Portable AC

Ever since I got my Portable AC, I've been wondering how I can make this chunk of junk more efficient because till this day, I have never been able to drop the temperature lower than 25 degrees ...
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2answers
137 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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36 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
30 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
38 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
24 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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39 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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1answer
49 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
100 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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25 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
148 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
99 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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17 views

Ducting options for HRV Install

Hoping to install an HRV in our house to improve winter air quality. One floor ranch with a full basement located in Vermont, so cold winters. The upstairs in entirely finished and there is no ...
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0answers
69 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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1answer
45 views

redirecting some air from outdoor A/C compressor into the attic to cool it down

I can't find any info on this question, and this might be a stupid idea... but anyway: The temperature in the attic is ca. 130F, 3pm, outside temperature 90F. ( Florida, 17y/o house ) Can I direct/...
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2answers
220 views

What are the options for filtering fresh air entering a building (especially outdoor air with wildfire smoke)?

I'm confronting once again the California wildfire season. The outdoor air quality is poor right now and it's spreading all over. If we bunker down in place I'm worried about the air conditions inside ...
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2answers
185 views

How can I increase airflow through an attic without soffit vents?

My house does not have soffit vents. The overhang at the eaves is too small. The ceiling leaks were sealed up by an HVAC company about 10 years ago. They also blew in insulation to an R30 level in the ...
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1answer
123 views

Two countdown timers connected to one inline fan — Does it work?

I'm planning on replacing two old bathroom fans with a single inline model installed in the attic (Panasonic WhisperLine). It will be connected with the two bathrooms through a Y-duct and exhaust ...
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1answer
33 views

What type Roof Vent is best to reduce ACU heat load?

Currently have a split level with 600 sq ft each with 1 turbine and 1 louvred vent on low side and 2 louvred vents on high side. ACU operates excessively. Look at intake, insulation, new ACU, ridge ...
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96 views

Fan in tiny bathroom has no vent. Is there a better option to absorb/reduce moisture/odors?

I lease an apartment and was just cleaning the light/fan combo (a NuTone NUA-40LN) in the ceiling of my very tiny but full bathroom and realized the fan in the ceiling is just blowing air around, but ...
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1answer
90 views

Is it safe to seal the seams/gaps on washer and dryer units?

Specifically, I have the following model units: Maytag Washer WTW8040DW Maytag Gas Dryer WGD8000DW4 The units come with open seams, and I'd like to know if it's safe to seal these? Surprisingly, ...
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35 views

Installing Roof - What else should be done?

When installing a new roof, what other work would be convenient to do? Since I'm having a new roof installed, I'm curious if there is something I would regret not doing in a few years. Potentially ...
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1answer
94 views

Will I have trouble running a bathroom fan 10 CFM (25%) stronger than needed?

My bathroom measures in at 289 cubic feet. Dividing that by 7.5 and rounding up gives me a target fan capacity of 40 CFM. However, there are many more fans available at 50 CFM. I read this post, Are ...
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23 views

Tricklevent on narrow uPVC windows?

I have some condensation issues inside a few bedrooms in my house, and I want to install trickle vents on the existing uPVC windows. They are old (20+ years), and I am hoping to get a few more years ...
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39 views

Sharing kitchen hood and kitchen ventilation through one duct

My kitchen currently does not have a kitchen hood, so I'm planning to install it. At the moment there is a ventilation duct, my idea is to connect the hood pipe to the ventilation pipe in the drop ...
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1answer
60 views

Heating home by blowing hot air in to desired areas

I am looking in to upgrading the heating system in my house, and I am surprised that I can hardly find any systems that heat up the house by blowing hot air in to the desired areas, as is standard for ...
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1answer
465 views

How long should the smell of silicone caulk last?

I recaulked around my tub last night with 100% silicone caulk. It's now been a bit over 12 hours, so the caulk is set and I can get the tub wet (according to the instructions on the tube), but the ...
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2answers
93 views

Redirecting cold air from a floor-vent to ceiling

The bedroom on the third floor of my house has floor one floor vent for supply and one for return. In the summer, the central AC works extra hard but yet the bedroom is only about 75% cool compared to ...
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46 views

CFM ratings of inline duct fans far exceed the ratings for their intended duct sizes. What are we to make of this when designing a system?

My garage is 25×29' with 10' ceilings, so 7250 cf. I'm hoping to be able to turn over the air every 3 minutes or so, so aiming at using 2 fans rated at a total of 2400cfm. The fans I'd like to use ...
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8answers
8k views

What is this tube sticking out of my roof?

I'm not sure what kind of vent this is for, but I'm wondering if its supposed to have a cap to protect from rain. Sorry for lack of description. I'm completely ignorant to whatever this is. If it ...
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2answers
784 views

How can I ventilate efficiently a tiny room under my stairs?

Under the stairs that take to my bedroom there is a tiny room, as big as a cupboard. I can barely stand in it. I smell mould in it, I tried keeping its small door opened and I think situation vastly ...
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1answer
205 views

wiring hrv in a confusing house

some beautiful pictures first time posting apologies if my placement is off Buying HRV. I am debating between two units, venmar evo5-700 which doesn’t support furnace interlock or lifebreath rnc205, ...
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3answers
46 views

What should I do about the floor for a outside metal shed / ventilation

I put together one of those 1 million fastener sheds from lowes. I didn't do a lot of ground prep but tried to make it as flat as possible. There were initially some areas under the perimeter wall ...
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1answer
65 views

Is it worth adding a 2nd roof vent to an unfinished detached garage?

If a "2.5" car (24x24ft) garage has one roof vent near the top, is there any use in adding an extra roof rent? The garage is unfinished/uninsulated, and there is no obstruction of air between the roof ...
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2answers
511 views

Is there a recommended size for vents in boiler cupboard doors?

I have replaced doors in my house and would like to replace a plain boiler cupboard door — standard 1981mm x 762mm (6½ft by 2½ft) door — with a 6-panel door matching the ...
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1answer
663 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
47 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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1answer
55 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
78 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
998 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
114 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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58 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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