How to Make a DIY Air Filter | Ask This Old House

Trong video này, giải thích cách thức hoạt động của hệ thống lọc không khí và cách chế tạo một bộ lọc không khí DIY được bản địa hóa. ĐĂNG KÝ Vào Ngôi Nhà Cũ Này: Chuyên gia công nghệ gia đình, Ross Trethewey hướng dẫn cách hoạt động của hệ thống lọc không khí và cách chế tạo bộ lọc không khí tự làm tại chỗ. Ross giải thích về hệ thống lọc không khí MERV. MERV là viết tắt của Minimal Efficiency Reporting Value, một giá trị đo lường mức độ hiệu quả của bộ lọc ngăn chặn các hạt có kích thước khác nhau đi qua và vào hệ thống không khí. Xếp hạng càng cao, bộ lọc càng hiệu quả trong việc thu giữ các hạt nhỏ hơn. Xếp hạng 1-16 là sử dụng HVAC; nói chung, các ngôi nhà thường có xung quanh một hệ thống MERV 5-12. MERV 17-20 là bộ lọc HEPA, được sử dụng trong bệnh viện và phòng thí nghiệm. Ross giải thích rằng chủ nhà không thể chỉ lắp một bộ lọc MERV 16 hoặc HEPA vào nhà của họ. Trong nhiều trường hợp, hệ thống HVAC mà chủ nhà sử dụng chỉ đơn giản là không đủ mạnh để xử lý các bộ lọc được đánh giá cao hơn, vì không khí càng phải trải qua nhiều quá trình lọc, thì càng phải vượt qua nhiều lực cản hơn. Ngay cả khi bạn muốn có một bộ lọc dày hơn để tăng diện tích bề mặt, nghĩa là ít điện trở hơn, bạn sẽ phải kiểm tra xem hệ thống HVAC của mình có đủ không gian để lắp một bộ lọc dày hơn hay không. Kiểm tra với kỹ thuật viên HVAC để kiểm tra mức đánh giá nào mà hệ thống của bạn có thể xử lý. Nếu bạn không thể có được một bộ lọc được đánh giá cao hơn, Ross sẽ trình bày cách chế tạo bộ lọc không khí tự làm của riêng bạn. Bằng cách sử dụng bốn bộ lọc không khí MERV-13 và dán chúng vào tất cả bốn mặt của quạt hộp, bạn sẽ có một bộ lọc không khí cục bộ cho bất kỳ phòng nào bạn muốn. Với khoảng 150 đô la, bạn có thể có một chút lưu ý khi cháy rừng và các thảm họa khác ảnh hưởng đến của chúng ta. Thời gian: 20 phút Chi phí: $ 150 Cấp kỹ năng: Người mới bắt đầu Danh sách mua sắm: Quạt hộp 20 inch [
Four 20x20x2 MERV-13 air filters [
Duct tape [
Cardboard cutout [

1. Cut out a piece of cardboard that’s the same size as the box fan to use for the back.
2. Place the cardboard on a table and take the four air filters and stack them on the edges of the cutout, with the airflow arrow pointing in (air intake side).
3. Take duct tape and secure each filter to the fan.
4. Duct tape the cardboard backing.
5. Place the fan on the other side and secure it with duct tape.
6. Remember that you’ll have to replace the filters every once in a while. For Ross’ DIY system, the filters should be replaced about every six months.

Where to find it?
Ross built the air filter using four, 20x20x2, MERV-13 air filters, which Ross got from Filterbuy ( ). He duct taped the filters to a cardboard box and a 20-in 3-Speed Box Fan, which is manufactured by Lasko ( ), though any 20” fan would work for this application.

Expert assistance with this segment was provided by Neil Comparetto.

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About Ask This Old House TV:
From the makers of This Old House, America’s first and most trusted home improvement show, Ask This Old House answers the steady stream of home improvement questions asked by viewers across the United States. Covering topics from landscaping to electrical to HVAC and plumbing to painting and more. Ask This Old House features the experts from This Old House, including general contractor Tom Silva, plumbing and heating expert Richard Trethewey, landscape contractor Jenn Nawada, master carpenter Norm Abram, and host Kevin O’Connor. Ask This Old House helps you protect and preserve your greatest investment—your home.

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a DIY Air Filter | Ask This Old House

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  1. I made one two weeks ago. As of today, the fan is running slower and making a creaking noise. Help.

  2. so you're not gonna run it on video? it was right there!

  3. where can I get the mesh material that they use for portable air conditioners? the kind of portable air conditioners that have the exhaust hose that goes into the window

  4. Had to cut away laminate flooring to frame a wall. The MDF dust storm it caused was ridiculous. Install have to cut about 20 ft in length so will be doing this. Not sure I’ll build a box, I’ll just slap on a filter on the back and set it near where I’m cutting. Also buying a new circular saw with integrated dust port 😎

  5. would never recommend anyone install one of these high rated merv rated air filters for their HVAC system. Better off with a mid-grade system air filter and just setting up hepa air filtration units in bedrooms or main living space throughout the home. Strongly recommend Electrolux Oxygen 3 systems (discontinued but if you can find them they are great) or Blue Air hepa air filtration systems. Blue air more costly but units are solid and work well. This prevents that unnecessary burden on your HVAC system as those high grade merv rated filters will bog your system down and can severely shorten HVAC system life span.

  6. Of course duct tape. This is what it was made for.

  7. which way is the box fan? Is it cord in the back?

  8. Skyrocketcoast

    Made 1 using ' Tyvek Tape- light weight tape & lasts ages!!
    1st box+ 4 sides 2inch merv 13+ fan lasted 2 -1/2 years. Making new one June2022.
    And we put a cardboard shroud in top of the fan too.
    Odd note: the tyvek tape is also used around my outside window screens, if there is a gap.

  9. Voice for the voiceless Truth

    You never cease to amaze me! If only our own lockdown government looked at filtration as a solution!

  10. You are not making filter…. you are just assembling fan to the filter….

  11. This old house always putting out quality stuff, still one of my favorite shows

  12. You will not filter out viruses. Forget it. You need something that neutralizes the virus . like short wave UV.

  13. This guy doesn’t know his history 🌋🤣

  14. What about so much pressure drag on the fan for pulling harder with 4 filters what are the odds of the fan overheating and burning up?

  15. Whatchyamacallit

    Ross, the Ben Shapiro of home DIY

  16. Not sure those box fans are made to run that way. Probably better to run cardboard along bottom of fan so fan can sit upright.

  17. Kash Is Everything


  18. Cryptick Cryptick

    Filter Charger can make the filters better. There is a commercial HVAC product called "filter charger" you can get that will spray on an ordinary furnace filter and make the filter catch more particles. Scientifically, this is basically a wetting agent that does not dry out, so it makes the filter catch more particles because there is little water droplets on it.

  19. лилиана долгова

    Works great with Fastly.Cool , exactly as described. Love the fact that it can push, pull, or exchange air with the push of a button. The remote is a nice bonus too!

  20. Love this video has Mr. Wizard's World vibes to it.

  21. Trudi Trahan-upchan

    I have standing fans, allergic to diesel, fragrances, laundry soap & my bedroom & bathroom were full of such fumes leaking in from windows and floor boards. I finally managed to seal the leaks on the floor & bedroom window but to detox the rooms I saw a TV report similar & bought Merv11 wrapped it around my stand fans and amazing this removed all the diesel fumes from my bedroom and laundry fumes from my bathroom. I keep them running and I can finally sleep without wearing a gas mask. I have paid a fortune for air filters since 1986 and Merv11 wrapped around a fan is even better than anything I ever had.

  22. “That’s really good actually.” @6:40

  23. I've always used one of the low mervs at the entrance of the filter box, to save the hepa filter from the animal hair clogging. My a/c is in a small room with a 2' door. It has a filter in the door, prior to the air entering the a/c unit. I'm considering building a box that will sit just inside the door, with the 20" box fan, to pre-filter the air and take some of the load off of the a/c unit!

  24. That duct tape is wrong, use metal reinforced tape.

  25. Fantastic. Need this in Sacramento CA!

  26. slave No. 4028

    i mean I appreciate the video but dude on the left is really killing the mood for me. his vibe is just not pleasant, a bit impatient, a bit arrogant, a bit cynical. maybe a midlife crysis, who knows

  27. I would just be curious how long you could go before you have to change all those filters, compared to just using 1 filter.

  28. Great discussion. Regarding safety, has anyone ever heard of ANY type of fan causing a fire for ANY reason? I’m certain it’s possible, but …

  29. Wow this is a great idea and I’m going to do it for my wife in my master bedroom 👌

  30. 5:53 How much air moves thru this system? 900 cfm on high speed. A 2500 sq ft house gets 1 full air change every 20 minutes, 3 air changes every hour… MERV13, change out every ~6 months… 

    I may try this with painter’s tape, on surfaces that contact fan. May be easier to remove for filter changes yet still for ok seal. Can always go back to duct take if not burley enough… Fire season 2018 with so many particulates in the thick air was hard on the dogs but thankfully brief. 2018 prepared us well for COVID19 from 2020 thru now, 2022…

  31. Left guy look like Chris hansen

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