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Due to the current Coronavirus epidemic and lockdowns, we want to help keep your home’s Indoor Air Quality at its best.

We also want to keep our staff working.

So, from now through December, 2020, we are offering our FILTERSCAN WiFi Home Air Filter Monitor at an amazing 23% off our retail price. That’s $99.95 for the peace of mind that you are keeping the air circulating in your house as clean as possible. At this exceptionally low price there is a limit of ONE filterscan per household.



The FILTERSCAN WiFi® Home affordable airflow sensor and differential pressure monitor sends you a text or email when it's time to change your home's air furnace filter.

    Under Pressure: How Many Cubic Feet Of Air Are Passed Through An Air Filter Each Year?

    Posted by CleanAlert Blog Team on Oct 5, 2015 12:12:00 PM

    Ever wondered how, exactly, you can measure the cubic feet of air going through your home's air filter? 

    There is no one easy answer to this question because it depends on many factors.

    These include considerations of what is the fan CFM on high, what is the fan CFM on low, is continuous fan being utilized, what are the heating and cooling CFM’s, how many hours is the fan running in heating speed, cooling speed, continuous speed, etc However, it’s essential that we and the clients understand the sheer volume of air that has to pass through an air filter annually. It is equally important that they know where the indoor pollutants come from.


    nafahq.org give an awesome example to calculate: 

    Let’s use an example in the specification sheet:

    The furnace is electric 18 KW with a 24,000 BTU air conditioner

    Lets assume single stage heat only factory setting at 1400 CFM; cooling single stage at 840 CFM; continuous blower at 434 CFM.

    There are 8760 hours in a year (24 x 365)

    Heating accounts for 2000 hours a year

    Cooling accounts for 400 hours a year

    Therefore continuous blower accounts for 6360 hours (8760 – 2400)

    Note: These hours may be challengeable but reflects good educated numbers.

    2000 hrs x 60 min x 1400 cu. ft. =      168,000,000 cu. ft.

    hr                min

    400 hrs x 60 min/hr x 840 cfm =        20,160,000 cu. ft.

    6360 hrs x 60 min/hr x 434 cfm =      165,614,400 cu. ft.


    Total cubic feet circulated in a year   353,774,400 cu. ft.

    If this were a 1700 sq. ft. bungalow with a full basement the total volume would be 27,200 cu. ft. (1700 x 2 x 8)

    Total annual air changes circulated by the furnace fan within this home would be 13,006   (353,774,400 cu. ft. / 27,200 cu. ft.)

    Indoor pollutants can be compared to Charles Schultz’s character Pig Pen (“Pig Pen” effect, Fugler CMHC)

    • Cotton fibers (lint from clothing and fabrics)
    • quartz (found in sands, gravels, tracked in on footwear)
    • carpet fibers (break down of the fibers)
    • cellulose fibers (paper towels, tissue, toilet paper, newsprint, attic insulation)
    • skin flakes (our bodies)
    • pet dander (our pets bodies)
    • insect feces, etc

    Don’t forget the impact that large rooms can have on particulate removal. Low velocity air allows airborne particulate to fall out of suspension before they can be returned to the air filter.


    Topics: Home Air Filters, Pressure