|Manufacturer Part Number||DPFPC16X22X5OB=DYO|
General G-99 Air Filter Gauge Kit
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Top Customer Reviews
This Air Filter gauge takes the guesswork out of when to replace the filter. In my case after 6 months of usage I got the message of replace filter. Apparently the furnace installer choose 6 months as the life expectancy of my filter. The filter still looked pretty good to me however, but I ordered a replacement filter at the same time as ordering this Gauge Kit. I installed the gauge kit, and calibrated it with a fresh filter installed. Then to get a comparison reading I put back the 6 month old filter. The reading increased slightly with the old filter but still well within the good range.
I'm guessing I could have delayed purchase of the $80 replacement filter for another 6 months.
I'd recommend that you recalibrate the gauge each time you install a new filter since even new filters do not always perform the same. Also the air handling blower should be running at it's highest normal speed, when calibrating and/or checking the filter gauge, since this is also when you'll see the highest reading.
I did lots of research about this. It's hard to find specs for filters. So I bought about 5 different types. I set up a crude "device" to compare the airflow from each: taped a half-sheet of notebook paper to a vent in our dining room, then swapped filters and measured the distance of the paper off the floor for each one. I did find measurable differences, but knew this was pretty rough.
So I bought this filter gauge. It confirmed my tests but with much more accuracy. Compared to the filter I finally ended up using (a polyester one sort of like the cheapo fiberglass) a brand new Filtrete registered as "dirty" with the gauge.
One more hint for anyone doing the testing I did: we have an instant-read thermometer we use for cooking. I taped it to a heat duct right next to the furnace to see the difference in the temp with different filters. This was crude too, but it worked (as far as showing the differences between filters, but not the actual heat rise in the furnace).
Reasons it didn't work out.
1. Different medium have different restriction. The furnace docs even say what to expect from the different types, and the restriction build between clean and dirty is different. Thus, I can't know if it is time to change the filter when the needle goes into the red.
2. My furnace is a 90%+ furnace as is common these days. The blower runs at all different CFMs, based on what the controller decides based on its sensors, and whether you are running heat, AC, or just the circulation fan, and the CFM range is huge. My furnace even says it auto-compensates for filter restrictions when it starts to get dirty. However, the device can only be calibrated for one CFM. It might work better on a furnace with a fixed speed blower and standard 1" thick fiberglass filter.
3. Will you actually look at it? I didn't, once the novelty wore off. I looked at it when there seemed to be not much air coming out, and then it was way overdue.
I believe the furnace manufacturer is in the best position to tell you when the filter needs to be changed.Read more ›
Most Recent Customer Reviews
The concept is fantastic. Although the gauge indicator needed to be freed up by lightly it's sanding edges. Inside it was randomly sticking during operation. Read morePublished 5 months ago by buyer
In our HVAC Air Handler we could not find a suitable location to mount the sensor that did not compromise the Freon Coils Integrity.Published 13 months ago by craig Longenecker
Husband installed this and it works well to tell us when the filter is dirtyPublished 14 months ago by Char J.
Good concept, I think it works pretty good, I bought 3 of them but the issue like which I think some others mentioned is when you have a variable speed fan you have to force it to... Read morePublished 16 months ago by Sleekun
Works great on the furnace. I can now get an idea of when to change the filter.Published 17 months ago by mikewiz
this little gadget is really takes the guess work out of wondering how your furnace filter is doing. when it starts to get dirty it indicates by the sensitive needle. Read morePublished 19 months ago by huey
These work great if you install and use them correctly. As others have indicated, the hole that you drill is larger than the nipple, so you need to seal the hole well. Read morePublished 21 months ago by Ryan G.
Worked for a day or two then stopped cold. If you taped it, it would move but would never give the same reading. Don't waste your money. Read morePublished on June 26, 2014 by Arthur R. Greenwood