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.
What happens if I use a smaller air filter?
Air Filter Problems with Poor Fit
If the filter is too small, it won’t cover the entire space and may allow dust and dirt to flow past. If you’re not sure what size filter you need, check the manufacturer’s specifications or ask your HVAC technician for help choosing the right product.
Is it bad to have the wrong size air filter?
Using the wrong size air filter won’t necessarily damage your HVAC system, at least not immediately. … Using the wrong size reduces the efficiency of your heating and cooling system. This can quickly add up and becomes more of an apparent issue you’ll likely notice on your next utility bill.
Can air filter be cut to size?
Answering the Question: Is it okay to cut an air filter to fit? … Simply put, yes, you can cut an air filter if you know what you are doing, and if the filters you use will not become too weak from the cutting.
Does an air filter have to fit perfectly?
Your air filter should neither be small or big for your system. It should be the perfect fit to prevent the possibilities of indoor air illnesses.
Can I use a 4 inch filter instead of 1?
While a 4-inch-thick filter is more efficient than a 1-inch filter, the right size depends on your furnace. If you measure the filter slot, and it’s large enough to accommodate the thicker filter, then you can use it. However, if the slot is less than 4 inches wide, you’re stuck with using that thickness.
How tight should an air filter fit?
How tight should a Furnace Filter fit? When you remove the existing filter, take note of the dimensions printed on its frame. Your new filter will need to match this size for the system to run efficiently. It should fit snugly but not so tight that you can’t easily slide the filter in and out.
Can I use a bigger air filter?
Air filters should, at least, have flow capacity to matched the engine’s needs. Failure to select filters sized large enough is detrimental to optimum performance AND economy. A secondary benefit of a filter with larger than needed surface area is longer time before replacement or cleaning.
Can I use a larger furnace filter?
If your current furnace only allows for furnace filter sizes with a depth of one inch, HVAC contractors can modify the furnace to accommodate larger sizes. This does take work and time. However, homeowners get to use better furnace filter sizes that do more for home comfort. They also worry less about their furnaces.
Can I use a 4 inch filter instead of 5?
Going down in thickness by an inch shouldn’t be a big deal – for example, you should be able to use a 4-inch filter instead of a 5-inch filter. … Higher MERV ratings work best when the filter is 4” thick or thicker because they trap extremely small particles, which means contaminants will build up quickly on the screen.
Can you put an air filter in wrong?
If you install your filter in the wrong direction, air will have a hard time flowing through the filter’s material and your air handler will have to work overtime to make up for the loss of airflow. This is not only a waste of energy, but it can also possibly damage your air conditioner or heating system.
Can you cut MERV filters?
This air filter holds its shape and requires no frame support. Simply cut to size and install. It is washable and reusable, maintaining efficiency for up to 1 year.
What size air filter do I need without a filter?
Follow these 3 easy steps to measure your HVAC filter size:
- Step 1 – Measuring Length and Width (L x W). (If your filter is not a square, the smallest measurement goes first).
- Step 2 – Measure the thickness (Depth) of your filter from front to back.
- Step 3 – Put Your measurements together (L x W x D).
Can I stack two 1 inch air filters?
Bottom Line: Putting two filters will not make it last longer but may make you have to replace it earlier, assuming it doesn’t already reduce air flow too much with just the filters.
Do Furnace filters have to be exact size?
Your filter or HVAC unit should have both the nominal and the actual size written on it. If you can’t find the actual size, it’s a good idea to measure it just in case. Our website categorizes filters by the nominal size, making it easier to navigate and find your filter.