From the Winix website: Filter A – 115115 Compatible with Winix air cleaner models 6300, P300, 5300, 5500, 5300-2, 6300-2, AM90 and C535
Yes I have had them for five years and they work great.
No, the replacement filter S is the correct filter for the Winix C545.
Unfortunately, these will not fit the C545. The C545 uses Filter S – 1712-0096-00.
Yes, according to the Winix manual.
They do sell them separate.You have to search for them via WINIX website.
No, if you have the D480 you want the Winix Replacement Filter D4. Either way when I ordered the filter from home depot they shipped it without a shipping box and my filters came crushed with torn retail boxes, I'd pick them up in person if you can.
Yes filter A is the correct one.
This does not fit the P450, you need Winix filter E - 113250 according to the website.
I have 2) 5300-2 and 1) 5500 units. They use the same filter sets. Type A, 115115. My guess is yes, it will fit.