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General Aire G99 Media Air Cleaner Filter Gauge

3.7 3.7 out of 5 stars 194 ratings
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Purchase options and add-ons

Brand GeneralAire
Material Filter Screen
Compatible Devices Air Cleaner
UPC 683786040028
Manufacturer General Aire
Unit Count 1 Count

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General Aire G99 Media Air Cleaner Filter Gauge
This item: General Aire G99 Media Air Cleaner Filter Gauge
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Product details

  • Is Discontinued By Manufacturer ‏ : ‎ No
  • Item model number ‏ : ‎ G-99
  • Date First Available ‏ : ‎ August 23, 2006
  • Manufacturer ‏ : ‎ General Aire
  • ASIN ‏ : ‎ B0195UXV7O
  • Customer Reviews:
    3.7 3.7 out of 5 stars 194 ratings

Product Description

Since the cleanliness of all homes are not equal, GeneralAire includes an easy-to-use, easy-to-read gage. The air filter media will load, capturing airborne particulates, raising the gage indicator to the red-zone, letting you know it’s time to change your filter.

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Customer reviews

3.7 out of 5 stars
194 global ratings

Customers say

Customers like the functionality, ease of installation, and value for money of the air filter. They mention it works well, is a useful instrument, and is easy to install. Some say it saves money by indicating when the filter needs replacing rather than guessing. However, some customers have issues with the build quality and disagree on its accuracy and adjustment screw.

AI-generated from the text of customer reviews

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FunctionalityEase of installationValue for moneyAccuracyAdjustment screwBuild qualitySensitivity
50 customers mention "Functionality"43 positive7 negative

Customers like the functionality of the product. They mention it's easy to adjust and works well as an indicator on the cleanliness of the media. Customers also say it's a useful instrument to help them know when the furnace is running. They appreciate the simple and effective design.

"...So far the unit is working well and is accurate...." Read more

"...G99 Media Air Filter Gauge" is an inexpensive, easy to install, useful instrument to help you know when the furnace filter needs to be replaced...." Read more

"...So in our experience, these gauges appear to work and be accurate. even if they're off slightly, it's a lot better than guessing." Read more

"...Otherwise, both gauges were easy to adjust and work well. Now I know at a glance when its time to change filters." Read more

48 customers mention "Ease of installation"44 positive4 negative

Customers find the installation of the product easy. They mention it's simple to install and use with just a drill and screwdriver. Customers also appreciate the good instructions and self-adhesive pad on the back.

"...What could be easier?Tom said this unit was super easy to install. It took him less than fifteen minutes...." Read more

"The "General Aire G99 Media Air Filter Gauge" is an inexpensive, easy to install, useful instrument to help you know when the furnace filter needs..." Read more

"...It's that simple...." Read more

"This little device was easy to install next to my main filter in the hallway of the house...." Read more

13 customers mention "Value for money"13 positive0 negative

Customers appreciate the value of the air filter. They mention it's a decent, low-cost product that does the job economically and saves money by indicating when the filter needs replacing.

"The "General Aire G99 Media Air Filter Gauge" is an inexpensive, easy to install, useful instrument to help you know when the furnace filter needs..." Read more

"...Saves money by indicating when the filter needs replacing rather then guessing after 3 months or whenever when in fact the filter might still be..." Read more

"...It is black and dark blue, so a little harder to see clearly. The price wasn't bad, and it doesn't need fluid topped off like the fluid nanometers." Read more

"This is a decent low cost product, but you have to adjust it every time you put in a new filter...." Read more

17 customers mention "Accuracy"8 positive9 negative

Customers have mixed opinions about the accuracy of the air filter. Some mention it's sensitive enough to detect subtle changes in air velocity, and a great way to gauge when you need to change your filter. Others say the guage is all over the place and not accurate.

"...This is NOT a precision gauge. If you want something more precise, you need to get a water tube gauge...." Read more

"...So far the unit is working well and is accurate...." Read more

"...tube sicks unfiltered air through an orifice with the result being inaccurate readings...." Read more

"...Once installed it seems reasonably sensitive and can have an initial baseline adjusted with the set screw." Read more

11 customers mention "Adjustment screw"5 positive6 negative

Customers have mixed opinions about the adjustment screw of the air filter. Some mention it's easy to set the needle in the base setting when you put a new filter in, while others say it's too sensitive and hard to keep from turning.

"Works OK. I just changed the filter for the second time and had to re-calibrate the gauge...." Read more

"...Once installed it seems reasonably sensitive and can have an initial baseline adjusted with the set screw." Read more

"It’s very sensitive and the adjuster screw is hard to keep from turning by itself...." Read more

"...Otherwise, both gauges were easy to adjust and work well. Now I know at a glance when its time to change filters." Read more

5 customers mention "Build quality"0 positive5 negative

Customers are dissatisfied with the build quality of the air filter. They mention it's poorly made and not reliable.

"Good product but poor quality control. They have change the color scheme from a red and green gauge to a blue and black gauge...." Read more

"...It may cost more, but it needs a sturdier build for a consistent result." Read more

"Good idea, but poorly made. Hard to adjust pointer. Moves around and drifts. pos." Read more

"Not reliable." Read more

5 customers mention "Sensitivity"0 positive5 negative

Customers are dissatisfied with the sensitivity of the air filter. They mention it moves around and drifts. Some customers also say the negative pressure indicator doesn't return to the same position after turning off the power.

"The indicator tends to stick." Read more

"Negative pressure Indicator does not return to same position after turning power off and back on...." Read more

"Good idea, but poorly made. Hard to adjust pointer. Moves around and drifts. pos." Read more

"Installed the gauge and it has not moved from start point in one year so I do not think it works." Read more

For those who want to be both thrifty and green.
5 out of 5 stars
For those who want to be both thrifty and green.
Great little money saving system. Drill 3/8 hole, peel 2 sided tape sheath and stick in. I put electric tape on the back side to seal it off tightly (though it really doesn't matter. 10x air flow gets through the gaps around your filter opening) and had it adjusted in 2-3 minutes.
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Top reviews from the United States

Pamela Audeen Poddany
5.0 out of 5 stars DOING A GREAT JOB
Reviewed in the United States on January 13, 2013
Verified Purchase
GENERAL AIRE G99 MEDIA AIR CLEANER FILTER GAUGE

With so much on everyone's plate and ME never thinking about furnaces and such, my husband decided to purchase and install this nifty little gauge. This gauge will tell him when it's time to change the filter in the furnace. Or, I can even see when it indicates it is time and then I can go nag him about it!! What a great deal!

The unit registers the state of the filter every time the furnace runs. A little needle points to the status of the filter which is listed on the gauge. I saw it running this morning. When in the green area the filter is clean. When the needle starts to hit the red, time to change the filter! What could be easier?

Tom said this unit was super easy to install. It took him less than fifteen minutes. He used an electric drill with a 3/8 inch bit. The gauge is installed anywhere in the blower chamber. By the way, we have a gas furnace --

The directions were excellent and simple to understand. So far the unit is working well and is accurate. This should also help improve the efficiency of our furnace because now we {Tom} will be changing the filter on time. We use fleeted throw-away filters.

Wouldn't it be nice if these nifty little gadgets were standard equipment on all furnaces. Tom wishes he would have purchased this a long time ago!

Thank you.

Pam
33 people found this helpful
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Wayne
4.0 out of 5 stars Furnace Air Filter.
Reviewed in the United States on February 13, 2012
Verified Purchase
The "General Aire G99 Media Air Filter Gauge" is an inexpensive, easy to install, useful instrument to help you know when the furnace filter needs to be replaced. It is VERY important to get the correct air flow quantity to keep the unit running and save you money on heating and cooling. This device has already saved me more than $50 by showing the filter I was sold to replace the original was too fine to get the correct amount of air to keep the heat running when the outside air temp. was 15 degrees F. Every furnace should have one of these gauges installed at the factory.
14 people found this helpful
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Nick S.
5.0 out of 5 stars The "Coolest" thing in HVAC since ... HVAC!
Reviewed in the United States on August 23, 2018
Verified Purchase
I've been a professional HVAC engineer my whole career, with a passion for home energy efficiency. In fact, I was 2% energy savings away from winning our utility's residential energy savings contest. Almost won a Prius, but settled for a $5k washer/dryer set. Damn ex and her hour-long daily hair dryer routine. I digress...

It's always amazed me how companies like 3M can get away with selling people a $30 filter that *might* last a month, maybe half a month, maybe 3 months.... how are we customers supposed to know when to change it?! It's just like printer companies making all their profits on selling ink cartridges, but a hundred times worse. Imagine replacing that cartridge when it's half full!

Enter this little $18 gem. Gee Eeee Emmmm, GEM. In all my days of HVAC love and trickery, how have I not seen this before?!

For one Andy Jackson and 30 seconds with a drill, you'll finally know when to replace your air filters. It's that simple. As another reviewer stated, it's an absolute shame every residential system in the US doesn't come with one of these built in.

And as a few HVAC contractors have mentioned, the cheapest better option is a huge, cumbersome $50-150 Dwyer Magnehelic gauge. Don't get me wrong... They're great. I've specified them on jobs for decades. Our maintenance guys live by them. Wonder why they don't just guess and replace the filters in commercial buildings every few months?? Because it would cost a FORTUNE. As it is, my employer's annual filter bill is over $500k! We also have 20M square feet and 135MW of turbine-powered generation on our campus, but that's another story.

Finally, a few critics here have noted the "controlled leak" principle on which this device operates will cause unfettered dirty air to enter your system and home. Folks, this leak is MINUSCULE in comparison to the existing leaks in your HVAC system. The average ductwork system in the US leaks 30%. So for an average 3-ton, 1200cfm system, that's 360CFM, or about 5x what a typical bathroom exhaust fan flows! IMHAPO, (in my humble albeit professional opinion), this unit likely flows WELL under 1cfm.

TLDR, get one for yourself and send one to Mom and Dad while you're at it... you won't regret it!
37 people found this helpful
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Top reviews from other countries

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Danny Dee
5.0 out of 5 stars Shipping said 10 days made it to me in a mere 5. 😎
Reviewed in Canada on October 21, 2019
Verified Purchase
Product is an exact match to it's predecessor.
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Michel Aubin
3.0 out of 5 stars C'est juste correct
Reviewed in Canada on June 19, 2023
Verified Purchase
Je l'ai installé sur le retour d'air de ma fournaise centrale, et ce n'est pas très précis.... Difficile à qualibrer..
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Julie P
1.0 out of 5 stars Needle won't adjust to the "filter is clean" zone
Reviewed in Canada on October 25, 2020
Verified Purchase
We've installed this with a 5" media filter that's about 2 weeks old. The hole was drilled after my furnace filter in between the blower and filter just like the picture diagram. We tried adjusting the needle and no matter what we tried it stays stuck on the furthest side of clean. We cannot adjust it to the middle notch where it's supposed to be. We've turned that screw clockwise where it was really tight and loosened it where the screw came apart. Nothing we do gets that needle to the "filter is clean zone" . It's as if there's no negative pressure with our merv 13 filter. The only way we can get the needle to go in the "filter is clean zone" is if we turn the unit clockwise so that the upper left and lower right corners are 12 and 6 o'clock like a diamond (which is not correct as its supposed to be level. I bought 5 of these and 3 were tested do the same thing. We put duct tape around it so no air leaks through the 3/8" hole which is too loose. I'm guessing a 1/4" or 9/32" would have sufficed. We spent quite a bit of time looking for a video to install or some other instructions but couldn't find anything. I really wanted to give this a 5 star but I believe this is either defective or the people I paid to do my furnace who have several hundred reviews that are in the 4.7 star range just did something wrong. As in with the furnace filter so that air just by passes around the filter mostly.
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Aaron Crabbe
2.0 out of 5 stars Not impressed
Reviewed in Canada on November 27, 2021
Verified Purchase
Not impressed with this. Fell apart while installing it. Had to rivit the face back on because I lost the plastic pins that didnt work anyway. We will see how it works but I have low expectations and little to no confidence in this product
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Aaron Crabbe
2.0 out of 5 stars Not impressed
Reviewed in Canada on November 27, 2021
Not impressed with this. Fell apart while installing it. Had to rivit the face back on because I lost the plastic pins that didnt work anyway. We will see how it works but I have low expectations and little to no confidence in this product
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Amazon Customer
4.0 out of 5 stars Time to change the filter
Reviewed in Canada on March 28, 2018
Verified Purchase
Fun little gadget. Lets you know what you already think you know.... that it is time to change the filter.
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