1 Brand New (unopened)!
The second one I assembled, only to find out I ordered the wrong size. This was never installed.  I have folded it back up for shipping.
My loss your gain, selling both for the price of 1. 



Only used with the Quikbox filter box , these Envirowise filters can last up to 6 months and is easily replaceable by you or your installer.

American Standard / Trane / Service First Part # FLRQB5AH18M11 , up to 6 Month Filter Life

Specifications: OEM Expandable Media Filter; 17.75x20x4.7 , MERV11 , Part number # FLRQB5AH18M11

These Filters are ONLY USED with American Standard or Trane QuikBox Housings , Images Shown for Illustration Only

Replaces / Supersedes: 17.75 x 20 x 4.7 20x18x5 FLRQB5AH18M11 QwikBox EnviroWise Qwik Box Enviro Wise Filters FLRQB5AH FLRQB5AH18 and others