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8
votes
2answers
210 views

How to detect mildew or fungus?

We live in an apartment, and since a couple of months, my girlfriend suffer from all sort of lung/breath/throat problems. ( Multiple visits to the Doctors give the same result: she has nothing, might ...
7
votes
8answers
11k views

Where should my furnace filter go in a Lennox G40UHX series furnace?

I have a Lennox G40UH(X) series furnace, which is installed in our attic (We have a single-story house on a slab). Because the furnace is installed in the attic, it is "laying down" on its side, and ...
5
votes
2answers
40k views

Which way does air flow into a furnace?

Which way does air typically flow in a furnace? Put another way, does the filter usually sit before the incoming cool air reaches the burners or after? I'm trying to figure out which way the air flow ...
5
votes
5answers
4k views

How often should the air filter in the furnace be changed?

Does the period of change of this air filter have an affect on the longevity of the heating and a/c system? What is a good rule of thumb to require replacement?
4
votes
1answer
3k views

What would cause my furnace to only work with the filter removed?

My Carrier furnace works fine without the air filter in place on the return. With the filter in place it works for a while and then stops with a complaint about "limit, or flame rollout is open" ...
4
votes
3answers
4k views

Why does the pilot light go out when the furnace is running?

Every time the furnace fires up, it blows out the pilot light. Sometimes it will run a full cycle and blow out when it shuts down, and sometimes it will blow out about a minute into the cycle. We ...
3
votes
3answers
4k views

Can I sense filter replacement need based on filter pressure drop?

I should first point out that the system I'm referring to will be a self build DIY project. Fan and Filters being the only items purchased complete, And I'm still in the design phase but I'm not a ...
3
votes
2answers
2k views

Why is my furnace filter alarmingly clean?

I have central air and heat at my appartment I moved into about 6 months ago. Today I decided it was probably long past time to figure out how to change filters in the furnace so I poke around until I ...
3
votes
3answers
2k views

How can I improve ventilation in my room with a window fan while filtering pollen from a nearby tree?

This is a campus building in Aalto University where you have a tree about 10 cm away from the window. The Espoo city does not allow the student organisation AYY to cut down the tree. There is a poor ...
3
votes
4answers
5k views

Why would a furnace overheat with a standard density filter?

Some time ago I found my furnace (gas, forced air, downdraft) was getting stuck on, blowing cold air. I could reset it, but it would happen again after a while. After calling out a service man, I ...
3
votes
1answer
78 views

How can we measure the air quality index of our room?

My house is situated near a construction site and dust, particulates, etc gather in really quickly. My room is currently set up such that there are two different air filters running continuously ...
2
votes
1answer
279 views

Will an electronic air filter harm my furnace?

If I install a furnace-mounted, electronic air filter, like this one, will it harm my furnace due to reduced air flow? How will I know if it reduces air flow too much?
2
votes
2answers
75 views

What methods exist for filtering air to alleviate allergies?

I've found out that I have an allergy, especially for the mold. I live in a very wet climate, so it's a problem. I was given advice to buy this AIRFREE E60 air purifier. But now I'm interested to ...
2
votes
2answers
117 views

Combining Air Conditioner with Air Purifier

I have a small 5th floor flat, with high ceilings. The sash windows, which are tall, face south. There is a very busy road underneath the windows. Two rooms have these windows. It's noticeable that I ...
2
votes
2answers
441 views

Are High End Furnace Filters worth the cost?

There are many levels of furnace filters. I can get cheap ones at walmart of a few bucks. Then there are ones that cost upwards of $30. I realize that if you have allergies or low immune systems, ...
1
vote
2answers
1k views

Is there a filter-reminder thermostat that uses run-time instead of total time?

My HVAC filter is in my crawlspace and is a hassle to change. I don't want to change it more than needed. "Change it every month" is bogus advice because in some months (like May) we don't have to run ...
1
vote
4answers
2k views

Are 5" thick filters for furnace/Central AC still available?

My furnace/AC was installed about three years ago. It uses 16" X 25" X 5" filters. The problem is when I try to find a replacement at my local home center: at Lowe's, Home Depot, (you name it), I ...
1
vote
2answers
193 views

How do I choose a furnace airfilter?

I have a furnace/air-conditioner that can support filters of various thicknesses: 1", 2", or 4". Filters are available in various MERV ratings. How should I decide which filter to use?
1
vote
1answer
91 views

Replace reusable air filter with disposable, when no size matches?

My friend's house has HVAC whose air filter is a rectangular metal frame filled with washable fiber mesh. It doesn't look like it could catch fine particles. We wanted to try an off-the-shelf ...
1
vote
1answer
80 views

How do I connect a 24v air purifier to hvac?

I have a MicroPure MX4 that the previous homeowner left behind new in the box. This is a 24v unit and needs to be hardwired. My question is can I connect the two wires to the terminal where the ...
1
vote
1answer
94 views

Can houseplants actually improve air quality?

I just moved to a new apartment. If I close the windows, the air gets heavy and stale very quickly and I get a headache. The place has laminate flooring (which looks pretty realistic, I thought it ...
0
votes
1answer
118 views

Air purifiers keep smelling like ozone

I know that every electric motor produces some ozone, it's unavoidable. Most of the time I don't notice it. We had a Honeywell HEPA room air purifier (basically a fan which pulls in room air through a ...
0
votes
1answer
151 views

How do I wrap the pre-filter around the HEPA filter in this air purifier?

I bought this air purifier and was installing the pre-filter that came with it. The instructions go "Carefully wrap the pre-filter around the HEPA filter so that the ends meet. Fasten the ends ...
0
votes
3answers
52 views

Protect from 3D Printer fumes [closed]

I'm planning to buy 3D Printer that can only print with ABS (Zortrax). I have a small child (3 months old) at my flat so I'm afraid that fumes can have negative impact on her health. What should I ...
0
votes
1answer
48 views

Allergies and an economizer

I had an economizer added to my HVAC system last fall, which is fantastic for cooling my second floor down in the evenings during the shoulder seasons where the weather is cool in the late afternoon ...
0
votes
1answer
92 views

How can I determine what size and type of filter is required in my air handler?

I just moved into a new house with a Trane Air handler (model TWE065E13FB) in the crawlsapce. I went to replace the filter as this was suggested maintenance and I found that there isn't a filter in ...
0
votes
1answer
113 views

How can I determine what grade air filter is appropriate?

I'm trying to figure out what kind of air filter is appropriate for my house. My local home warehouse store stocks over a dozen options. The primary difference between them seems to be Microparticle ...
0
votes
0answers
26 views

Can I clean indoor HEPA filters with an acid wash? Hydrogen peroxide?

I have two HEPA filters in my house that are at least 5 years old. I clean them regularly (take them outside with a respirator on and blow them out with an air compressor), but I'm concerned that ...