TL;DR
Changing a 16x22x5 filter in an Electro-Air media cabinet takes about 10 minutes and no tools: turn the system off, slide out the old filter, and slide in a new one with the airflow arrow pointing toward the blower. Buy by the actual size printed on the old frame: 15.38 x 21.88 x 5.25 inches. Most 5-inch filters last about three months, sooner with pets or allergies.
Key Takeaways
Actual size: A nominal 16x22x5 filter measures 15.38 x 21.88 x 5.25 inches, so depth runs a quarter inch large.
Arrow direction: The arrow on the frame always points toward the blower, away from the return duct.
MERV choice: The EPA recommends MERV 13 or the highest rating your system can handle.
Timing: Replace every 90 days at the latest, closer to six weeks with allergies or asthma, and two months with pets.
What Is a 16x22x5 Electro-Air Filter?
A 16x22x5 Electro-Air filter is a 5-inch replacement pleated air filter for Electro-Air media air cleaner cabinets. The label is the rounded-up size; the frame reads 15.38 x 21.88 x 5.25 inches.
Electro-Air 16x22x5 replacement air filters are 5-inch pleated media filters with an actual size of 15.38 x 21.88 x 5.25 inches, made in the USA by Filterbuy and offered in MERV 8, MERV 11, and MERV 13 ratings, according to the product listing.
Width runs 0.62 inches under nominal, length 0.12 inches under, and depth 0.25 inches over. My rule for a frame with a worn-off label is to round width and length up and depth down, which lands right on 16x22x5.
Like any central HVAC filter, a 16x22x5 cleans whole-house air. Its depth holds more folded media than a 1-inch filter or a 2-inch MERV 8 filter, which lowers airflow resistance and stretches the time between changes.
How Do You Change a 16x22x5 Filter in an Electro-Air Cabinet?
Power the system down, swap the filter with its arrow facing the blower, and latch the cabinet door tight. Keep a flashlight, a marker, and a vacuum nearby.
Turn the system off. Set the thermostat to Off, then flip the service switch near the furnace or air handler.
Open the cabinet door. It lifts off, swings open, or unlatches, depending on the cabinet.
Photograph, then remove the old filter. I snap a phone photo of the label and arrow first, which settles the reorder size and arrow direction in one shot. Slide the filter straight out.
Confirm the actual size. The old frame should read 15.38 x 21.88 x 5.25.
Clean the cabinet. Vacuum the tracks and floor, and look for crushed gaskets or loose seams where air could bypass the filter.
Insert the new filter. Slide it in with the arrow pointing toward the blower. If it binds, stop and recheck the size.
Seal the door. Fasten every latch and replace a torn gasket. A crooked door lets unfiltered air slip past the filter, the bypass problem the EPA's guidance on keeping HVAC systems clean tells homeowners to check for, and a loose fit is a common cause of filter rattling.
Restore power and log the date. Turn the system back on and write the install date on the frame. I also set a 90-day phone reminder. A strip of painter's tape on the cabinet door listing the actual size and MERV lets anyone in the house reorder without opening the cabinet.
Which Way Does the Airflow Arrow Go?
The arrow points toward the blower, following air from the return duct through the filter. It points up on an upflow system, down on a downflow system, and sideways toward the air handler on a horizontal attic unit. A reversed filter loads unevenly.
Which MERV Rating Should You Choose for a 16x22x5 Filter?
For most Florida homes, MERV 11 is the practical middle, and MERV 13 is the pick for allergies or asthma. The EPA's explanation of MERV ratings notes that higher numbers capture more particles between 0.3 and 10 microns.
MERV 8: Catches dust and larger pollen. Filterbuy's MERV 8 version of the 16x22x5 suits low-occupancy homes or tight budgets, and readers in Canada can order the same MERV 8 size from a Canadian supplier.
MERV 11: Adds better capture of pet dander and finer pollen; the same rating is sold in 1-inch sizes, like a 17x20x1 MERV 11 filter. This MERV 11 vs. MERV 13 comparison helps if you are torn.
MERV 13: Captures smaller particles, including some smoke, though filters alone cannot stop every germ. The EPA says most systems run MERV 13 without problems when the filter is changed regularly.
How Often Should You Change a 5-Inch Filter in Florida?
Check a 5-inch filter monthly and replace it by the 90-day mark at the latest. Most schedules assume a system that rests half the year; a Florida air handler rarely does, so I treat 90 days as a ceiling and let the filter's color make the call.
Shorten the interval to about six weeks if someone has allergies or asthma, since dust mites and pet dander are common indoor asthma triggers, and to about two months with pets. The EPA's wildfire smoke guidance also recommends more frequent changes during heavy smoke. Staying on schedule pays: the U.S. Department of Energy reports that replacing a clogged filter can cut air conditioner energy use by 5% to 15%, and a dirty filter raises winter energy costs too.
Thinner filters need changing sooner, as this site's guide on how often to replace an air conditioner filter explains. Common 1-inch sizes such as a 14x25x1 MERV 8 six-pack, a 14x25x1 four-pack, or a 16x30x1 MERV 8 four-pack need monthly checks, and even in winter a 1-inch filter's change schedule can run 20 to 45 days. Deep 4-inch filters sit in between, as this look at how long 4-inch MERV 8 filters last shows.
The flashlight test: shine a flashlight into the return-side face of the pleats. If light glows through, the filter has life left. If the pleats look solid gray and swallow the beam, change it, whatever the calendar says.
When Should a Technician Check the Cabinet?
Have a technician check the media cabinet at every annual tune-up, the same filter-plus-tune-up routine used for other deep filters. The technician can check the fit and door seal, then confirm system airflow meets the manufacturer's specifications with your MERV rating.
Call sooner if the pleats bow toward the blower, the door whistles, or a new filter grays within weeks; each points to an airflow or bypass problem a filter swap will not fix. Many Florida homeowners also add UV light installation or air ionizer installation, and leaky ducts are worth raising with duct sealing companies or a professional duct sealing service.
"When we build a 16x22x5, the frame runs just under nominal width so it slides into the cabinet track, while the pleat pack runs a full 5.25 inches deep to fill the cabinet front to back. That fit is why a 4-inch filter or a trimmed substitute never seals the same way, and why we tell customers to reorder by the numbers on the old frame."
Katelyn Redish, Author/Writer
Essential Resources
Electro-Air 16x22x5 replacement air filters with actual size and MERV 8, 11, and 13 options. Filterbuy's listing gives the actual size and replacement timing for each MERV option.
U.S. EPA: Guide to Air Cleaners in the Home. Explains that HVAC filters clean air only while the system runs and how to choose a rating.
ENERGY STAR: Heating and Cooling Maintenance Checklist. Lists do-it-yourself maintenance tasks, including monthly filter inspections.
Allergy & Asthma Network: Indoor Air Quality and Indoor Air Pollution. Advises changing HVAC filters at least every three months and servicing equipment yearly.
U.S. Consumer Product Safety Commission: Home Heating Equipment. Recommends a yearly professional inspection of fuel-burning heating systems.
Supporting Statistics
27.8 million people in the U.S., or 8.4% of the population, had asthma in 2023.
Source: CDC: Most Recent National Asthma Data
More than 106 million people in the U.S. experience allergies each year, about 1 in 3 people.
Source: AAFA: Allergy Facts
88% of U.S. households use air conditioning, according to the 2020 Residential Energy Consumption Survey.
Source: U.S. EIA: Today in Energy
Final Thoughts
If I could leave one habit with you, it is reading the old frame before you order, because the size printed there is the one your cabinet was built around.
Next Steps
Check your current filter. Read the actual size and installation date on the frame.
Pick your MERV rating. Match it to your household, then weigh system age.
Book your tune-up. Ask for a cabinet seal check and static pressure reading.
Frequently Asked Questions
Can I Use a 16x22x4 Filter in a 16x22x5 Electro-Air Cabinet?
No. A 4-inch filter leaves a gap in a 5-inch cabinet that air bypasses. Four-inch filters such as a 20x25x4 pleated furnace filter belong in 4-inch cabinets.
Is a 16x22x5 Filter the Same as a 15.38 x 21.88 x 5.25 Filter?
Yes. 16x22x5 is the nominal size, and 15.38 x 21.88 x 5.25 inches is the actual size of the same filter.
Can I Wash and Reuse a 5-Inch Pleated Filter?
No. Pleated media filters are disposable, and washing them damages the fibers that capture particles. Replace the filter instead.
What Should I Do With the Filter Before Leaving a Florida Home for the Season?
Install a fresh filter before you leave so the system idles on clean media, then check it the day you return. If it smells musty after months in a closed house, replace it early.
Keep Your Electro-Air Cabinet Working the Way It Should
Changing a 16x22x5 filter on schedule keeps your Electro-Air cabinet sealed and your coil clean. Pair it with an annual tune-up to keep the system ready for Florida's long cooling season.
Glossary
Media air cleaner cabinet: A metal housing between the return duct and the equipment that holds a 4- or 5-inch pleated filter. Homes adding a ductless mini-split while keeping a gas furnace still rely on it for the ducted system.
Electro-Air 16x22x5 replacement air filter: A 5-inch pleated media filter with an actual size of 15.38 x 21.88 x 5.25 inches, made in the USA by Filterbuy and offered in MERV 8, MERV 11, and MERV 13.
Static pressure: The airflow resistance technicians measure to confirm a filter is not choking the system.
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