Furnace Filter Slot Door Cover

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We’re All About Sealing Up Ductwork

In the video above we explain a very easy simple tip to seal the space around your furnace filter slot.

  1. May 30, 2013 - Explore Connie Corbett's board 'HVAC closet door', followed by 159 people on Pinterest. See more ideas about house styles, closet doors, home.
  2. The blower fan creates a negative pressure and pulls the filter flush against the air handler. The gap is going to pull air in from the room but even still it's still passing through the filter. It won't make much of a difference so yes it's ok. You could cover the gap with a strip of tape if you wanted.edit it's also the wrong way round.
  3. Easy filter access with use of snap clips and simplified “door” Made to hold a 4 inch furnace filter – smaller filters can be used, although you will need to secure the filter using spacers at the corners to prevent them from moving in the slot, these are not provided with this product.
  4. Hello Baltien and welcome to the How-to-Community. Baltien you’re missing something called filter frame or filter slot. Filter frame is the sheet metal profile that is normally placed in between the unit and the return duct (plenum).Typically these frames are sized to match the return box (duct) and the return box is sized to match the blower size.

If your unit has a standard filter slot (typically located near the blower unit) you can select a filter size within 1/8-in – 5/8-in. Smaller than the two longest sides. As mentioned above, you can also choose a longer filter as there is no door or cover that needs to be closed over the filter.

Cover

We want to deliver the airflow where it’s supposed to go and the furnace filter slot is a weak spot in every system that allows air to escape the filter and go directly to your furnace blower.

Why Is It A Problem That Some Air Escapes The Filter And Goes Directly To The Furnace Blower?

When air is not filtered, it allows all the dust, dirt, and allergens to go directly into your furnace blower and into your house. This will make your furnace dirty and less efficient. Your house will seem to have more dust, and dirt in your furnace creates many problems and will cause parts to wear faster and break more often.

Even More Important If Your Furnace Is Located In An Attic, Crawl Space, Woodshop, etc.

If your furnace is located in a dirty (woodshop, etc) or unconditioned space, the space around your furnace filter lets the air in that space escape the filter entirely and go directly to the furnace blower. Your furnace will be pulling humid, dirty air directly into the blower compartment. That is not a good thing at all. That’s why we recommend closing the space around your filter with something like the FilterLock by Allergy Zone.

We recommend the FilterLock Furnace Filter Slot Seal Door Cover to solve this pesky problem. See below for our affiliate link to the FilterLock Furnace Filter Slot Seal Door Cover.

It improves indoor air quality by blocking allergens, dust, and gases like carbon monoxide from entering your home.

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Is the air filter I have too small for my unit? We hear this question from a lot of our customers. Each air conditioning system or HVAC unit has a certain size filter that allows the filter to perform correctly by protecting your heating/ac system. The filters don’t need to fit with an “air tight” seal, but you should be able to easily install and uninstall your filter without a struggle, plus the filter shouldn’t be so small that it moves freely within your unit. Your filter should be a bit smaller on each side of the filter housing slot, thus allowing you to slide the filter in with ease. Most AC and HVAC units use standard sized filters, but some do require a custom size air filter.

FilterFurnace

Some Signals that Your Air Filter is Too Small:

1. The air filter moves around too much inside the filter housing slot.
2. When your unit turns on, you hear noises such as knocking, whistling, or rattling.
3. Once installed, the air filter does not completely cover the vent or duct opening.
4. You notice that the air filter does not seem to get dirty.

Consequences of Using an Air Filter That is Too Small:

1. The filter can be sucked into the ventilation if it is much smaller than it should be.
2. Dust, allergens and pollutants will not be filtered from your indoor air, as the air is bypassing the filter and entering into the ventilation and is returned back.
2. The filter will be unable to protect your AC/HVAC unit and the unfiltered air will collect on internal components of your system, such as the coil and fan, which can lead to expensive repairs.

If you are questioning whether or not your filter is too small, here are a few suggestions on how to check:

Furnace Filter Slot Door Cover Home Depot

Measure the air filter housing slot, but only the usable space where the filter can fit into. Make sure to take into consideration any overlaps or recessed edges that may obstruct installing or uninstalling the filter. For most systems you can use a standard sized filter within 5/8-in smaller than the air filter housing. If you are not able to find a standard sized filter within that parameter, you will need to order a custom sized air filter.

There are also air conditioning/HVAC units that are open-ended, meaning you don’t close a door or panel over the air filter housing. In these cases, you have more flexibility in selecting your filter size, as you can choose one that is longer than the size of the opening. This also gives you a pseudo “handle” that sticks outside the opening that allows you to grab onto for ease of removal when it’s time for the filter to be changed.

Filterlock Furnace Filter Slot Seal Door Cover

An excellent resource to help you is the US Environmental Protection Agency (EPA) Guide To Air Cleaners in The Home.

How to Choose Your Air Filter Size for Each Unit Type:

Allergy Zone Azfl-100 Filterlock Furnace Filter Slot Seal Door Cover

1. If your unit has wall and ceiling vents that do not have clips or brackets that secure the filter you want to find the closest fit possible (within 1/8-in. smaller than the opening) that prevents movement or noises as mentioned above.
2. If your unit has wall and ceiling vents that has clips or brackets that secure the filter you can select a filter size within a 1/2-in. smaller than the opening.
3. If your unit has a standard filter slot (typically located near the blower unit) you can select a filter size within 1/8-in – 5/8-in. smaller than the two longest sides. As mentioned above, you can also choose a longer filter as there is no door or cover that needs to be closed over the filter.
4. If your unit has a filter cabinet or drawer/large housing compartment you will need to select a specialty Whole House Air Filter (filter depth should be over 4 inches). Look for the part number or model number on the door/panel/housing or the reference number on the air filter to find the actual filter size.

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Furnace Filter Slot Door Cover Panels

Selecting the filters that are just right for your home can be difficult and confusing at times. At US Home Filter we understand this, which is why we offer an experienced staff to help answer any questions you may have. For personal assistance with your air filter needs, please contact us now online or call us at (855) 237-1673 and we will do our very best to assist you in selecting the right filter for your individual needs. We carry humidifier filters and pads for all major manufacturers (including Air King, American Standard, Aprilaire, GeneralAire and Honeywell). We want to earn your business and we guarantee your satisfaction! Take advantage of our quality products, vast selection, low prices, and enjoy FREE SHIPPING on every air filter order within the Contiguous USA.