Is this 2 air filters or one air filter?

i've ordered from this seller twice. you get 2 filters, each in a separate box as in the photo. they are shipped together. good price.

Specs on this product ad say it is 16" x 25". it measures twenty-nine not 25. my old aprilaire filter is 16 x 27-3/4. now what?

Thank you for your interest in our products. 16"x25" is a nominal size. The extra media on both ends help seal both ends of your air cleaner cabinet. It should still fit in your Aprilaire Air Cleaner. We hope this helps. Thank you.

Are the sizes 1 or 2 the quantity per pack, or is there actually 2 different sizes for the 413 filter?

There is a drop down menu for size 1 or 2. I figured out the answer after I asked the question. By switching to size 2 on the drop down menu and then reading the description, I figured out that size 2 is a 2-pack.

How frequently do I change them

Approximately every 6-9 months...sometimes longer. I usually check it at around 6 months & take it from there. I do use a cheap filter in my return air vent that I change monthly though because of the dogs hair.

ASIN	B00UOXM6W8
Brand Name	Aprilaire
Compatible Devices	Aprilaire Air Purifier Model: 1410, 1610, 2410, 2416, 3410, 4400, Aprilaire or Space Gard 2400 with upgrade kit
Customer Reviews	4.8 4.8 out of 5 stars (30,446)
Global Trade Identification Number	00686720041327
Included Components	(2) Aprilaire 413 Replacement Air Filter
Item Weight	1.27 kg
MERV Rating	13
Manufacturer	Research Products Corporation
Material Type	Synthetic Fiber
Model Number	413 02
Number of Items	2
UPC	100030703619 600363320205 686720041327 789957451133 736902493939
Unit Count	2.0 Count

Aprilaire - 413 A2 413 Replacement Air Filter for Whole Home Air Purifiers, Healthy Home Allergy Filter, MERV 13 (Pack of 2)

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