Can you double up air filters?

Can You Stack Air Filters? Do not stack multiple smaller air filters on top of one another to fit them into a larger air handler. Installing multiple 1” air filters in a 2” slot, for example, can cause costly damage to your AC unit, as residential furnaces are not equipped to handle this level of airflow restriction.

Can you use two air filters together?

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.

Can I stack 4 1 inch air filters?

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. … What you can’t do is stack filters — use only one.

Can I use a 2 inch filter instead of 1 inch?

As you can see the 2 inch filter will serve our needs MUCH better than the 1 inch filter. Even if the duct system is in good shape, using this filter will keep the system from struggling.

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Do higher for filters restrict airflow?

Generally, a filter with a higher MERV rating will reduce airflow. However, there are many other factors at play such as the size of the filter and the type of blower motor in your HVAC system.

Why do I have 2 air filters?

Scenario 1: Your HVAC system has multiple return ducts.

This is the most common reason why your central air system has two air filters. … Having multiple return vents solves this problem, but it also requires air filters at each vent to properly filter the air and prevent particulates from getting into your fan motor.

What happens if you use AC without filter?

Without a filter, the condensation drain will fail to drain the moisture from your AC unit. This will result in condensation accumulation on the Freon tubing. The condensation will then start dripping down the pan, causing water damage to the whole system.

Can I use a thicker air filter?

Most air filters are 1 inch thick, but some systems can accommodate filters 2 to 5 inches thick. In our tests, we found that the thicker the filter, the better it works and the longer the replacement intervals. That means it’s better for you and for your heating, ventilating, and air conditioning (HVAC) system.

What if my air filter is too big?

Air Filter Problems with Poor Fit

If you purchase a filter that’s too large, it won’t slide into the slot correctly. If the filter is too small, it won’t cover the entire space and may allow dust and dirt to flow past.

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Does air filter depth matter?

If improving air quality is a priority for you, the depth of the filter doesn’t matter so much as MERV. … The higher the MERV rating, the smaller the contaminants a filter can trap—which also means it will clog faster.

Can air filters grow mold?

It is possible that some especially tiny spores might get through a HEPA filter. However, the real problem with HEPA filters is mold can potentially grow on the filter surface. If it is not changed regularly, the filter can actually become the host surface for all the mold spores it has trapped.

Why are some air filters thicker than others?

A thicker filter (4-5 inches) has more surface area and therefore allows more room for air to pass through. Thick filters, due to their increased surface area, also have other benefits like: Higher dust-holding ability (meaning it can catch a lot without blocking airflow)

What does Merv stand for?

Minimum Efficiency Reporting Values, or MERVs, report a filter’s ability to capture larger particles between 0.3 and 10 microns (µm). … The higher the MERV rating the better the filter is at trapping specific types of particles.

Is MERV 13 too high for residential?

One factor to consider is air flow through the system. … In some cases, using an air filter that is too restrictive for your system may cause low air flow problems as well. MERV 13 is the highest MERV value safe for residential furnaces; the higher ratings are used primarily in commercial units.

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Is MERV 13 too high?

Filters within a MERV rating of 17-20 are almost never necessary in a residential home. A MERV rating of 13-16 is considered hospital level air quality, so it is unlikely your home needs any more than that.

Is MERV 14 too high?

MERV 14 is too strong for most home HVAC systems.

And these are some of the best on the market. … MERV is an industry-standard, or rating. The abbreviation stands for Minimum Effective Reporting Value. In other words, it’s a measurement showing how small the holes are in the filter.