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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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Minimum loft size for positive input ventilation?

I'm having our roof redone and would like most of it to be vaulted. However, I'd also like a positive input ventilation unit to increase air movement through the house and reduce condensation. I'm ...
SingularityFuture's user avatar
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1 answer
69 views

How can I increase attic ventilation when ridge vents aren't enough

I am getting a new roof installed next week. Currently my house has ridge vents with perforated soffits. The problem I have is with the design of my roof, there isn't much of a ridge, so I dont ...
Anthony's user avatar
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Humidity in shed: options for shelf panels

I have a brick shed outside, with barely any ventilation except for 16 1x5cm slots between bricks. The floor is bare concrete. I renovated last year, and among other things painted the floor and ...
Julián Urbano's user avatar
1 vote
1 answer
53 views

How to find the bathroom fan with unknown location

I live in a Dutch house, and when I moved in the bathroom layout was changed including the location of the ventilator grid. However even in the original layout I only knew the location of the grid and ...
Dennis Jaheruddin's user avatar
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Ventilation and insulation for a wooden floor in a tenement house (renovation)

I have an apartment with a wooden floor in a tenement house. Construction: wooden joists, the neighbor's ceiling boards attached to them from below, then air up to the "blind ceiling", then ...
PolGraphic's user avatar
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1 answer
107 views

Close off gable vent? [duplicate]

I had a new roof installed on my house a couple of years ago. The new roof has ridge vent along the peak of the main roof as well as where this gable vent is. I was reading on an unrelated topic that ...
TBoneHuff1970's user avatar
1 vote
1 answer
49 views

Can HRV be filtered on the outgoing side? Ducted?

JThis may be two questions, but they're both about HRV airflow so let's try it this way... I'm interested in eventually adding a Heat Recovery Ventilator (HRV) to my basement workshop, for fume ...
keshlam's user avatar
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Active ventilation fan in encapsulated crawl space

I need some advice on where to place an active ventilation fan in my encapsulated crawl space. I have a dehumidifier positioned as shown in the diagram. The crawl space is encapsulated but lacks ...
Chris's user avatar
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1 vote
1 answer
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Installing door seal with MVHR system to prevent noise?

UK based, small apartment. I have a windowless bathroom with shower, and one mechanical ventilation heat recovery system (MVHR) linked exhaust. As such, installing a fan would involve some serious ...
Liam's user avatar
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2 votes
1 answer
193 views

Can we place a Ninja Foodie XL 6 in 1 convection oven where our conventional oven has been?

Our in-the-wall oven has died. We never really used it anyway. We have a Ninja Foodie 6 in 1 air fryer/convection oven that we use regularly. Can we place it in the spot where our built-in oven has ...
Stacey Perea's user avatar
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Is there a standard formula or rule of thumb for how much airflow a whirlybird/turbine roof vent will achieve given a diameter and a wind speed?

I've been looking for effectiveness measures for whirlybird vents for a while and I can't find anything in building codes, and only one empirical claim from askthebuilder.com for a relationship ...
Steve's user avatar
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Identifying and remedying soffit vents for proper attic ventillation

on post from the below where I noticed the roof does not meet with the fascia and soffit to form a tight seal. Is there supposed to be a gap between soffit and roof? I have continued to investigate ...
AdamO's user avatar
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Can I connect 3-core electrical wire to a 2-socket load?

I am completely new and inexperienced with electrical work but wanted to learn how to DIY a very basic exhaust fan installation in my kitchen. I built a hood that mounts onto a small window and bought ...
stephanieg8888's user avatar
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1 answer
31 views

Where should I locate an exhaust fan in a 110 square foot bathroom with an included 15 square foot toilet room

I have a 110 square foot bathroom with a 12 foot ceiling. There is an included toilet room 15 feet square with an 8 foot ceiling with what is probably a 50cfm exhaust fan in the ceiling. I want to ...
P Schmurr's user avatar
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Ventilation Vents for Closet with Furnace and Hot Water Heater

I have a closet with a Furnace and Hot water heater. The closest has a Luver door, I want to replace with a regular closet door. I have (2) 8 x 15 Vents which pull air into that room from my basement ...
Dwayne's user avatar
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New Soffit Vent Design Still Bad Idea?

I recently discovered that my 1-story ranch (hip roof) has both full baths venting to attic. Upon this discovery I’ve been trying to determine best approach for venting to outside. I’d prefer to not ...
LakeHouse's user avatar
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Shed Moisture problem

I keep getting moisture in the bottom part of my 12x12 shed. Mostly on the plywood floor but also on some of lower walls and bench about 3ft high and then seems to be fine above that. I have 8x8in ...
Dean's user avatar
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2 answers
84 views

Separate exhaust ventilation fans vs central exhaust ventilation

Context: we're in the Netherlands. Here, since about 30 years, all houses are built with what they call "mechanical ventilation". Actually, what they really mean is central ventilation, with ...
texnic's user avatar
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2 votes
2 answers
156 views

How to make ceiling vent go around ceiling beam?

I discovered my house kitchen vent doesn't actually vent anywhere. Since I cook a lot of Chinese food, it means the air is always oily. I bought a brand new high-powered ceiling fan, pulled out the ...
Village'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
4k views

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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1 answer
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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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56 views

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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0 answers
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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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0 answers
72 views

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
0 votes
1 answer
59 views

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
0 votes
1 answer
120 views

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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0 answers
107 views

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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0 answers
47 views

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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0 votes
2 answers
42 views

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
0 votes
1 answer
61 views

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 ...
Vic's user avatar
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1 vote
1 answer
112 views

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
0 votes
2 answers
75 views

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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0 votes
2 answers
129 views

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
1 vote
1 answer
289 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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0 answers
134 views

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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0 votes
1 answer
30 views

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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0 answers
44 views

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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0 votes
0 answers
77 views

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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0 votes
0 answers
198 views

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
0 votes
1 answer
36 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
268 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
254 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
90 views

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
0 votes
1 answer
93 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
0 votes
1 answer
746 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
47 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
  • 1
0 votes
2 answers
924 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
3 answers
2k 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
48 views

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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