Help
Find it. Fit it.
Change it on time.
Sizing, installing and the questions people ask most. See the FAQ
Find my size.
The size is printed on the frame of the filter you have now: width × height × depth, in inches. Order by that number, not by measuring.
Filters are sold by nominal size, so a 20 × 25 × 1 measures about 19½ × 24½ × ¾ in. That small gap is what lets it slide into the slot.
16×20 × 1 in on the label
Actual size ≈ 15½ × 19½ × ¾ in
2 Pack · $63.72 · 4 Pack · $127.44 · 10% off on a plan
16×20 × 1 in on the label
Actual size ≈ 15½ × 19½ × ¾ in
2 Pack · $63.72 · 4 Pack · $127.44 · 10% off on a plan
16×25 × 1 in on the label
Actual size ≈ 15½ × 24½ × ¾ in
2 Pack · $67.32 · 4 Pack · $134.64 · 10% off on a plan
20×20 × 1 in on the label
Actual size ≈ 19½ × 19½ × ¾ in
2 Pack · $72.72 · 4 Pack · $145.44 · 10% off on a plan
20×25 × 1 in on the label
Actual size ≈ 19½ × 24½ × ¾ in
2 Pack · $83.16 · 4 Pack · $166.32 · 10% off on a plan
20×24 × 1 in on the label
Actual size ≈ 19½ × 23½ × ¾ in
4 Pack · Sold out
24×24 × 1 in on the label
Actual size ≈ 23½ × 23½ × ¾ in
4 Pack · Sold out
12×24 × 1 in on the label
Actual size ≈ 11½ × 23½ × ¾ in
4 Pack · Sold out
16×20 × 2 in on the label
Actual size ≈ 15½ × 19½ × 1¾ in
2 Pack · $110.02 · 4 Pack · Sold out · 10% off on a plan
16×25 × 2 in on the label
Actual size ≈ 15½ × 24½ × 1¾ in
4 Pack · Sold out
20×20 × 2 in on the label
Actual size ≈ 19½ × 19½ × 1¾ in
2 Pack · $131.18 · 4 Pack · Sold out · 10% off on a plan
20×25 × 2 in on the label
Actual size ≈ 19½ × 24½ × 1¾ in
4 Pack · Sold out
20×24 × 2 in on the label
Actual size ≈ 19½ × 23½ × 1¾ in
2 Pack · $143.42 · 4 Pack · Sold out · 10% off on a plan
24×24 × 2 in on the label
Actual size ≈ 23½ × 23½ × 1¾ in
2 Pack · $164.88 · 4 Pack · Sold out · 10% off on a plan
12×24 × 2 in on the label
Actual size ≈ 11½ × 23½ × 1¾ in
4 Pack · Sold out
16×25 × 4 in on the label
Actual size ≈ 15½ × 24½ × 3¾ in
2 Pack · Sold out · 4 Pack · Sold out
20×20 × 4 in on the label
Actual size ≈ 19½ × 19½ × 3¾ in
4 Pack · Sold out
20×25 × 4 in on the label
Actual size ≈ 19½ × 24½ × 3¾ in
4 Pack · Sold out
24×24 × 4 in on the label
Actual size ≈ 23½ × 23½ × 3¾ in
4 Pack · Sold out
12×24 × 4 in on the label
Actual size ≈ 11½ × 23½ × 3¾ in
4 Pack · Sold out
Size not listed?Ask about a custom size
Install
Two minutes. No tools.
-
1
Find your size.
It’s printed on the frame of the filter you have now.
-
2
Switch off the furnace.
Then slide the old filter out of its slot.
-
3
Arrow toward the furnace.
Slide the new filter in with the airflow arrow pointing toward the furnace.
-
4
Write the date.
Use the carbon pencil in the box to write the change-by date on the frame.
Change schedule
How often to change your filter.
A filter past its date restricts airflow and makes your system work harder. Here’s how often to change yours, based on your home.
Standard schedule
Every 90 days
4 changes a yearFor most homes without pets or special air-quality concerns. Four changes a year keeps air moving and your system running efficiently.
Pets or allergies
Every 60 days
6 changes a yearFur, dander and pollen build up in a filter fast. Changing it every two months keeps air moving and your home fresher.
Smoke, smog or respiratory concerns
Every 30 days
12 changes a yearDuring wildfire season, in smoggy areas, or when someone at home has a respiratory condition, change it every month.
Stay on schedule. Write the change-by date on the frame with the carbon pencil in the box, scan the QR code for an email reminder, or choose a plan so your next filters arrive when they’re due.
Talk to a person.
Custom sizes, orders and your plan. We reply within one business day.
Phone
Email
Address
Zentek Ltd. · 1123 York Rd, Guelph, Ontario N1E 6Z1