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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White stuff in crawl area [closed]

I have seen white stuff on roof in crawl area above the bathroom next to exhaust fan. I need help because i have infant in House. What cause it How we can clean it. What kind of mold is this i ...
seema n's user avatar
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Black mold found behind crown molding, walls and ceiling. How to remodel correctly?

I bought a 1995 manufactured home on permanent foundation, ~26’x60’ home. 2x4 exterior framing. Entire interior walls, ceiling and trim had been recently painted. Odd musty and smoker smell upon ...
Daniel's user avatar
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8 votes
3 answers
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Is it a bad idea to install a bathroom vent in a drop ceiling without external exhaust?

I'm under contract for a condo in a large building with drop ceilings in the bathroom and no vent fan. I am told that some units have external ventilation capabilities and some don't but I don't know ...
aknodt's user avatar
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Is it ok that my wall air vent does not seal to duct?

I went to my attic today and saw that all of the bathroom exhaust fan duct pipes are put loosely to the hole on the inside of the vent. Does this look right? I’m afraid this would blow air to the ...
VuDuong's user avatar
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Attic Ventilation Help

Looking for some guidance. I've read through several other posts on this topic, but would like to get some insight on our specific situation. Any constructive advice is appreciated. We're finishing ...
PeteF's user avatar
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Changing cold air return vent hole shape

My house was built in 1980 and the vents are bulky and outdated. The cold air return vents are right angle triangle shaped coming very far out from the wall. Upon removing the vent cover, the hole is ...
Samantha L's user avatar
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Should a canted bay window roof have soffit?

We have a two story house are repairing some leaks above the canted bay window in our living room on the first floor. We got the leak stopped, pulled out the ceiling and affected insulation. After ...
Erin Heim's user avatar
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1 answer
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Ventilation for a bathroom [closed]

I think a 'mould fix company' is trying to rip me off. They say I have a really wet wall and need to replace the whole wall (inside plaster wall). The bathroom has one small window but is rarely ...
James Smith's user avatar
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How to fix attic sheathing being wet causing mold

I have mold in my attic. I have a mold remediation company that is going to come out and fix it but they will only warranty the work if the underlying issue is resolved. The roof sheathing is at 100% ...
anonjeeper's user avatar
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Range hood wall vent offset with 8 inch run

We bought a under cabinet range hood with a six inch round connection. The existing ventilation goes outside through a 3 1/4” by 10” horizontal vent cut quite close at about 11” from the top of the ...
Desertmiles 's user avatar
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How to Deal with an Open HVAC Vent Blowing Hot/Cold Air in Newly Bought Home?

I recently purchased and closed on a home and discovered an issue that wasn't caught by the general inspector. There's an open HVAC vent that blows hot or cold air depending on whether the heating or ...
terrabl's user avatar
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How to more effectively ventilate a portacabin

My son is sleeping in a portacabin that we didn't originally intend to be used as a spare bedroom and only has a single window at one end (no opportunity for cross flow ventilation). Particularly in ...
Richard Lang's user avatar
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Vaulted kitchen ceiling but now have moisture between roof and insulation. Possible cause and remedy? [closed]

We're re-doing our kitchen and decided to vault the ceiling. Previously, above the ceiling there was a good amount of attic space but now the insulation is right up against the inside of the roof, and ...
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1 vote
1 answer
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Condensation/mold on ceiling in bedroom + high humidity

I am having a strange issue wherein along the exterior/west-facing wall of my bedroom (~110sqft/750sqft house) at the junction with the ceiling there appears to be mold growing and some pretty faint ...
Vincent Huynh's user avatar
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2 answers
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Is there a ceiling ventilation outlet that can be remote controlled to open and close?

I'm trying to work out how I can close off select rooms for a loft-based MHRV unit. I am thinking there's motor based version of but my product searching online is showing nothing. Like my roller ...
paul_h's user avatar
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2 answers
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Bathroom exhaust fan to blow air directly behind it (with no turns)?

I need to add an exhaust fan to a bathroom. The layout is such that the fan will need to be in a wall, with the duct directly behind it. Ideally, the fan will take air into its grille, and send that ...
Ben Wheeler's user avatar
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1 answer
144 views

OTR Microwave vent through wall, but on bottom?

I was replacing my over-the-range microwave and discovered the location of the existing vent. The vent is straight out the exterior wall, but down towards the bottom mounting bracket… I can’t seem to ...
Andrew Boisvert's user avatar
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Ventilation in Attic Dormer

The ventilation in my attic never seemed like it worked correctly. Here's the backstory: There is a section of my teardown/rebuild home that protrudes about 3 1/2 feet from the rest of the house. The ...
SBerg413's user avatar
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1 answer
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Flatroof DYI vent in a maximum

My flat roof has just been redone by professionals. Before, I had a lot of mold in my attic (more of a crawl space), so we added a second maximum (now I have 2 of https://ventilation-maximum.com/en/...
william audet's user avatar
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advice on gambrel roof garage with 2nd floor apartment

1st time home owner, plan to keep property long term so like to do things the best way possible for long term. Doing as much myself as possible. Looking for advice on completing apartment above a ...
Mike's user avatar
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How much ventilation does a 30x30 detached garage need?

Let me start by saying we are in Houston. Very hot and humid during the summertime which lasts half the year. I have a 30x30 detached garage that I would like to fully insulate and drywall. It has 8ft ...
Chip's user avatar
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Am I taking the appropriate approach to insulate + properly ventilate my attic?

I have a question about the ventilation + insulation of my attic space, and what needs to be done to correct it. I apologize if any of my terms are incorrect, as I am certainly no engineer or ...
Sitcoms's user avatar
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1 answer
33 views

Proper Ventilation of a Wet Crawlspace

I moved into a renal house and afterward noticed my closet smells musty and damp. Ventilation of the crawl space under an exterior concrete stair is provided by a single screened vent on the exterior ...
Sally McFadden's user avatar
2 votes
2 answers
154 views

MVHR ventilation in a UK flat (apartment)

I'm interested in getting MVHR (mechanical ventilation heat recovery) or some similar system in a small flat (apartment) in the UK. I see all sorts of products advertised, which seem quite varied in ...
Croad Langshan's user avatar
2 votes
2 answers
203 views

Can I use a basement oil tank vent pipe to vent a 3d printer enclosure?

Currently, I have a 3D printer in my office where I work with a removeable vent that I fit to the window. I'm looking to move it into my basement. I'm getting an oil tank removed, and with it, I think ...
StevenPG's user avatar
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-1 votes
1 answer
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Is the gap between the sheathing and header on this wall functional?

I am insulating my garage. This exterior wall's sheathing stops a few inches from the header. The gray strip is metal flashing. Exterior to that is Vinyl siding. Does stopping the sheathing below the ...
Trey Davis's user avatar
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1 answer
65 views

Will solar fans go hand-in-hand with ridge vents and whole house fans?

I have ridge vents but I’m wanting to add a whole house fan and a solar attic fan.
Dlmorrow's user avatar
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1 answer
313 views

How to get rid of fog / odor in a bathroom without windows or an extractor fan?

The previous owners decided to cheap out and leave our suite bathroom with passive ventilation. There doesn't appear to be any wiring either, so adding a circuit would cost a lot of money and is a ...
Mark's user avatar
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0 votes
1 answer
33 views

Need Help Balancing Attic Ventilation

I live on a small remote island and I'm building a cabin out of what once was a barn. My soffits are plywood with a 2.25" diameter hole in the center of each 16" OC roof truss. This has ...
Joel's user avatar
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0 votes
2 answers
224 views

Is it better to have more, smaller-size soffit vents or fewer, larger-size vents?

My 120-year-old house has no soffit vents and 2 passive roof vents a couple feet below the ridge line (no ridge vents). I want to add soffit vents in the wood soffits to provide more airflow because ...
Victor R.'s user avatar
2 votes
2 answers
875 views

Does a vaulted ceiling with air gap above insulation require ventilation?

We are in process of re-insulating our roof by removing roofing, decking and accessing the cavity between rafters from above. The roofer told us initially that the rafters in the vaulted ceiling areas ...
Bob's user avatar
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0 answers
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Missing rafter baffles

My side attic gets super hot in summer and the room next to it is about six degrees warmer than other rooms. I see rafter baffles/ vents missing where the wall separating the room and the attic meets ...
Siva Budati's user avatar
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0 answers
167 views

Should there be a roof vent above electric furnace/heat pump?

I have a manufactured home with a heat pump and electric furnace. Above that is a vent to the roof with an insulated duct freely hanging and unattached. Should that be there? Would it be better for ...
Anthony Massie's user avatar
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0 answers
287 views

How to add intake vent to an attic of a hip roof without any eves?

My house has a hip roof with no gables or eaves. We have a ridge vent but no intakes. I'd like to install intakes to improve air flow and ventilation. I've seen a lot of on-roof vent products but they ...
everett1992's user avatar
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1 answer
57 views

How do I figure out my attic ventilation CFM - california fire safe vents [closed]

I'm looking to install a whole house fan for my 1700sqft house in northern CA. The install doesn't seem too complicated, but I don't know how to calculate the total amount of ventilation I have in my ...
Benshares's user avatar
0 votes
2 answers
234 views

Possible to install a mini-split condenser inside-ish?

Trying to install a multi-zone mini-split heat pump system in a small condo that does not have any accessible outdoor space* for condenser unit, however in the region jalousie windows are common and ...
Jared Zimmerman's user avatar
8 votes
1 answer
1k views

How can I ventilate my bomb shelter?

One of the 'quirks' of local public housing is that it comes with an 'ensuite' bomb shelter - basically a room of reinforced concrete with a pair of ventilation holes. I should be able to get plug in/...
Journeyman Geek's user avatar
0 votes
1 answer
45 views

Installing an exhaust fan to attic to cool house

No AC in house, No option to get one. I've been getting by with the usual tricks, but I think I may be onto a good idea and I'd appreciate some vetting. My attic has a drop tile entry, and I am ...
PoorSoddingNovice's user avatar
2 votes
2 answers
84 views

Garage Door Insulation vs Ventilation Grill [closed]

I am located in Houston, TX and so you can imagine how hot and humid it is right now in the summer. I live in a 3 story townhome style house with an attached garage. And another thing is that I also ...
Tizzle's user avatar
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0 votes
1 answer
697 views

Trying to replace the bathroom exhaust fan with a new fan and heater. How do I go about it from where I am now?

I have small whole bathroom with an older ventilator fan that has a heater with it. Unfortunately it's dead altogether so basically I have to replace the whole thing and so far have removed the ...
Robthechamp24's user avatar
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0 answers
30 views

Range Hood Pre-Instalation Questions

Is there any way to figure out if my hood vent is circular or rectangular before taking down the old hood? Album link New hood (click for fullsize) New hood (click for fullsize) Old hood (click for ...
PMMeThatTummyGirl's user avatar
0 votes
1 answer
243 views

To add soffits vents or not

I am in the process of getting a new roof and the roofer suggested that I should add soffit vents. This is a 1970s era home that has large gables on the sides. Please note on the higher level of the ...
GMD's user avatar
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2 votes
1 answer
67 views

Insulating/AC efficiency improvements

We moved into this house late last year. It is a 1992 cape style brick house. In short, our upstairs is miserable sitting in the mid 80s with the upstairs unit running from 11am-10pm. After doing some ...
Joshua's user avatar
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0 votes
1 answer
919 views

Venting a portable air conditioner to bathroom vent duct in an apartment

I am wondering whether it is ok to vent the hot air from a portable air conditioner to the same duct where the bathroom air vent is in an apartment considering that the apartment block removes the ...
ld_pvl's user avatar
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0 votes
0 answers
13 views

Bathroom Ventilation Leaking

My ceiling leaks when it rains and it’s right where my bathrooms venting system is. My bathroom vents through a piping system in the attic and then out through the roof. The pipe that sticks of the ...
Emma's user avatar
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0 votes
0 answers
254 views

Remove and seal up old air vents

I recently bought an apartment and have now realised that there are 4 old air vents in the flat that let cold air and noise in. The flat is right outside a restaurant and a pub and it gets super noisy ...
helpme's user avatar
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0 votes
3 answers
109 views

Alternate heat recovery systems upstairs and downstairs

I'm looking to increase the ventilation in my house by a little bit to compensate for measures we're using to reduce unintentional ventilation (blocking draughts). I don't need and can't afford a ...
Soy Capitan's user avatar
4 votes
2 answers
428 views

Why is my attic hotter after venting was updated?

I had my roof replaced last year and I am now seeing consistent temperatures in the attic that exceed 40 degrees over the outside temperature. For example, it was 62°F the other day and I had 108.5°F ...
Marc's user avatar
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0 votes
1 answer
316 views

Air circulation with soffit vents but no ridge vents

Ranch 1959 home. Soffit vents present but no ridgevents. 75% of ground floor airsealed in attic. Home in GA. I plan on re-roofing the first chance I get which may not be until next year. I'm not sure ...
Ignoramus's user avatar
0 votes
0 answers
70 views

What is the best way to cool a vaulted ceiling in a marine tropical environment?

A house I am working on has vaulted ceilings with no insulation or ventilation, so the rooms get very very hot during mid-day to afternoon, especially in the summer. The house has a white standing ...
William's user avatar
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