Questions tagged [air-quality]

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Do wall ac/heater units bring in fresh air?

I live in an apartment with a combined wall AC/heater unit, like the type that you often find in hotels. Does this bring in fresh air when operating, or does it just recirculate the air inside the ...
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How can I filter smoky air coming from outside when the only opening is a window? (How to improve this system)

We live in a small single room apartment just under the roof in a city center. Many of our neighbors burn wood and coal (among other things: it often smells of burned plastic). The toxic smoke comes ...
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Poor air quality in a small room

Due to covid, my workplace has permanently closed its HQ. As a function of such, we now all work from home. Only catch is I don't have an office and I have kids! To remedy this, I turned a "...
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Why are some HVAC UVC air cleaners listed as "return air models"?

I would like to install a UV Air cleaner, but most of them seem to be listed as return air models. Due to the .. odd nature of my furnace setup, I would really like to install this in the plenum that ...
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Artificially lowering CO2 concentration

Is there any way to realistically lower CO2 concentration in living rooms? Today only way to lower CO2 concentration is to basically bring the "fresh" air from the outside. But this is ...
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Is there a difference between combining two fans in parallel and buying one with twice as much CFM?

I want to build something like an "air purifier". I'm considering a box where I have a big filter and I send the air from one side to the other. I want to maximize the air flow through the ...
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Does there exist a standard for furnace UV lights?

When you're replacing neon light tubes you don't think twice about compatibility. The distance between the two pairs of pins on opposite sides of the tube is a fixed standard, the voltage (in one ...
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Propane vs. Natural Gas - Indoor Air Quality?

I've seen plenty of articles about gas stoves and the impact on indoor air quality. Specifically, there are reports of much higher CO2, NOx, PM 2.5 particulates, and formaldehyde, relative to electric ...
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Any reason to not use a concentric vent for HRV/ERV air exchange?

Planning to install an ERV (Energy Recovery Unit) and have been advised that a concentric vent is easier to install and the risk of short circuiting output and input is negligible. My feeling is if I ...
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Air-sealing basement slab weeping tile access for radon

I have a pretty high levels of radon in the basement (~400 Bq/m3 when windows are not open), so I want to seal obvious entry points, one of which is what looks like a 10 inch weeping tile cleanout ...
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Tiny Fibres/Dust Everywhere

I dust/clean/vacuum once a week which does make a difference to overall cleanliness/tidyness. However, even after cleaning, that very same day, there seems to be a new layer of dust/tiny fibres ...
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how should I determine the requirements for my specific crawlspace encapsulation?

I live in the San Francisco Bay Area. Low humidity and mild climate year round. I don't have any problem with mold or humidity in my vented crawlspace, but it is musty and I want to prevent that musty ...
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Using air humidifier wick cleaned with home detergent - Any health concerns?

I have been using humidifier with rotating wick, and used to clean it with domestos detergent. This detergent as said by manufacturer contains: Non-ionic surfactants <5% - particular type not ...
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What is the best method and tool to detect harmful non-carbon-monoixde gases?

I recently cleaned my home's air filters and discovered a significant increase in well-being. Previously, staying at home during the weekend for more than 1-2 hours resulted in fatigue and dizziness, ...
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How does one clean these filters after 6 months?

There's a great project on This Old House that uses 4x MERV 13 filters to purify the air on your house (even against covid-19 they say) Question; When it has been running in your house for 6 months, ...
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When would you want/have/need to put in a post filter in an electrostatic air filter system?

The HVAC system has an Electrostatic air cleaning system and it uses a prefilter and has a slot for a post filter. I've been reading online that only the prefilter is good enough to get the job done ...
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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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Is this black material in my HVAC air duct mold?

I live in an apartment complex in the southeastern United States. The apartment complex is made of brick so is probably fairly old, but my apartment was renovated just before I moved in. It has ...
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Do I need to worry about random nameless HEPA filters containing asbestos? [closed]

I bought a cheap "DIY" air purifier with HEPA filter. I think it was this one > https://smartairfilters.com/cn/en/product/hepa-filter/ Then I started reading the history of HEPA filters ...
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When it's smokey out, why does more smoke get into the house in the mornings and evenings?

We've had thick smoke outside our home for several days now due to the fires on the west coast. We're doing what we can to filter the inside air and keep excess outside air from coming in (covered ...
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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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Air Flow using Vacuum and High Air Pressure Air

I am investigating container homes. Something about the modularity appeals to me. Regardless, I am thinking about one of the challenges that they face is to get adequate air flow without cutting ...
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Is it normal to smell sewer gas from a plumbing vent?

We have a second floor room that is centered on top of the house - but this means that the windows of this second story are ABOVE the plumbing vents from the first floor. These plumbing vents are a ...
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1 vote
1 answer
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Basement Smell in Utility or Bathroom?

In our house, we have a partially below grade basement. Occasionally, our basement will smell like sewer gas (farts) but I can not determine where the smell is coming from. The basement does have ...
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Air purifier/humidifier - strange yellow substance

I have had this Sharp air purifier/humidifier for the past 6 months. After cleaning the humidifying filter today I have noticed a strange yellow slimy substance on the filter "fins". I have ...
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Possibly Asbestos Contaminated Washer! What do I do?

So a while back, while my mom and I were moving out of our last place, I may have stowed a bunch of stuff from the attic away in plastic trash bags, as the attic was apparently insulated with asbestos,...
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retrofit an installed HVAC system

My day care center, located in a 100+ year old house and only licensed for 28 kids, had an HVAC system installed about 15 years ago. Can it be set to vent ALL indoor air and send only cooled outdoor ...
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Since moving into a new house we are constantly ill including both my dogs. Is this house the cause?

We moved into a brand new council house just under 2 years ago in the UK and since then we have had nothing but problems with our health. I am disabled so already had health issues but they have ...
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1 vote
4 answers
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How can I darken a bedroom yet let air in as much as possible?

Of course one could use a vent but this is not feasible for me. Is there a low-tech solution, like some kind of a specific curtain? I could also cover my window with an opaque board, letting some ...
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Choosing air-conditioner's BTU power for humidity

Recently, I've been cut off of access to sun and fresh air to my apartment. It is completely sealed now, with no windows or sun to the walls or roof. Ever since, humidity has grown a lot, and mold is ...
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Ventilating a room with no forced air without opening windows?

I would like to ventilate my bedroom because air quality monitors show CO2 levels rising above 2000ppm every night. I have two windows in the room, both with blackout blinds, but I prefer not to open ...
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How to permanently get rid of old cigarette smell from previous resident?

We have recently moved into a rental apartment (built early 1990s). The previous resident was a smoker, and there is a distinct smell of cigarette smoke. She lived there for 15 years. The apartment ...
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What is the difference between the filter on my furnace and an Air Exchanger?

I live in the Pacific Northwest (Seattle area) and the allergy season has started for me. It is so bad that I am thinking about getting an air exchanger for next year. The house I live in was built in ...
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How can I get rid of the bacteremia in the floating in the air! [closed]

How can I get rid of all that chemical bacteremia floating in the air!
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1 vote
1 answer
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How to remove moisture from kitchen air?

Our new home has a kitchen in a corner without a vent-out channel. As far as I understand, standard kitchen hoods can't condensate and collect water from the air they process. What can be an ...
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7 votes
6 answers
2k views

Letting fresh air through a window without letting noise in

I live in an apartment and it's pretty noisy outside, so I usually keep my windows closed. It does get pretty stuffy inside though, so I'm wondering if there's a way to get air through the window ...
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1 answer
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How should I ventilate an air-tight concrete room?

My house has an unused cistern that abuts the foundation. I've cut a doorway into it from my basement and would like to use it as living space. I would like to install a door to obscure and ...
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21 votes
6 answers
10k views

How to get rid of CO₂ in a house with A/C in hot summer?

Recently, I've been measuring the CO₂ concentration during multiple nights and the levels in the bedroom where I sleep are very high and unhealthy (over 1600 ppm). I use an AirVisual monitor, which ...
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Do I need to sanitize my air vents after I remove a bird from them?

I am quite positive I have a bird in my air vents. I plan to remove it tonight but I'm not sure what I should do afterwards. Should I have a company sanitize the vents/system? I just don't want any ...
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I need a stronger fan for this CO2 scrubber

This image is a CO2 scrubber I'm trying to optimize. It's 3 inch PVC with a fan to draw or force air over soda lime to extract CO2 out of the air. It presently drops the CO2 level a small amount, and ...
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2 answers
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How do I keep indoor air quailty high without letting in the outdoor air? [duplicate]

The outdoor air is polluted. Is it possible to keep the indoor air quality high without letting outdoor air in? Maybe with plants?
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Why does my cork subfloor test positive for formaldehyde?

This week I have been having engineered wood flooring installed, with a 1/2 in. cork subfloor installed to help reduce sound transmission between upstairs and downstairs. I bought a tester off of ...
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Can I run an air cleaner and air conditioner at the same time without a significant counter effect?

Can this be counter effective, or the opposite? I assume this also comes down to what I am using the air cleaner for, it is for dust allergies, but also vs air pollution. I also guess that I need ...
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After market air filter replacment

I have a Lennox heat pump which has an air handler with a Lennox X7935 Carbon Clean Healthy Climate MERV 16 Filter installed. These filters are like $105 per at least. When we purchased this whole ...
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2 answers
12k views

How often and long should my fresh air intake run?

My builder installed a fresh air timer on my furnace, a 24-hour pin timer with 15-minute increments. When it's on, it runs the fan and opens the fresh air damper. The resulting air that comes from the ...
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Should I filter polluted outside air as it comes through my window or clean it inside the room?

Situation: apartment of 42m², ground level, recent from 2013 humidity is 40% apartment near a big city, in the suburbs near freeways we have a very good air handler with 2 extraction systems: one in ...
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263 views

Filter Air coming through window

There is a window in my back side of the house. i wanted to keep open the window of the backside just to keep the house warm. but there is a public bathroom in the backside and i feel very bad smell ...
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4 votes
2 answers
15k views

Can i use air filter that is one inch smaller

Currently, i have a 16x25x1 filter in my furnace/ac duct (probably a better term out there). I am at the local store and they seem to be all sold of all brands of 16x25x1. They do however have an ...
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Why do space heaters make the air smell like that?

My parents live in a country house and they've got a bunch of space heaters of various designs. Some of them are: Heating coil and a fan (hot air blower) Oil-filled battery Flat electric battery (no ...
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1 vote
1 answer
179 views

Stale air in house with windows [closed]

Here's a rough diagram of the apartment: There's absolutely no air flow in the apartment, probably because of the directions (up = south) The worst area of the apartment is the left section, as it ...
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