![Box fan with 3M MERV 12 Filtrete filters on the front and back, duct taped. I have a small room, will this do the trick as a Corsi-Rosenthal box? Not sure why Box fan with 3M MERV 12 Filtrete filters on the front and back, duct taped. I have a small room, will this do the trick as a Corsi-Rosenthal box? Not sure why](https://i.redd.it/pzxps9iins6a1.jpg)
Box fan with 3M MERV 12 Filtrete filters on the front and back, duct taped. I have a small room, will this do the trick as a Corsi-Rosenthal box? Not sure why
![Nordic Pure 20x24x1 MERV 12 Pleated Plus Carbon AC Furnace Air Filters, 3 PACK, 3 Piece : Amazon.co.uk: Home & Kitchen Nordic Pure 20x24x1 MERV 12 Pleated Plus Carbon AC Furnace Air Filters, 3 PACK, 3 Piece : Amazon.co.uk: Home & Kitchen](https://m.media-amazon.com/images/I/712W66TOFEL.jpg)
Nordic Pure 20x24x1 MERV 12 Pleated Plus Carbon AC Furnace Air Filters, 3 PACK, 3 Piece : Amazon.co.uk: Home & Kitchen
![Filtrete 16-in W x 25-in L x 5-in 12 MERV 1550 MPR Allergen, Bacteria and Virus Electrostatic Pleated Air Filter in the Air Filters department at Lowes.com Filtrete 16-in W x 25-in L x 5-in 12 MERV 1550 MPR Allergen, Bacteria and Virus Electrostatic Pleated Air Filter in the Air Filters department at Lowes.com](https://mobileimages.lowes.com/productimages/4f157ffb-27e3-4d2a-abbe-4494318ee3d3/63493914.jpg?size=xl)
Filtrete 16-in W x 25-in L x 5-in 12 MERV 1550 MPR Allergen, Bacteria and Virus Electrostatic Pleated Air Filter in the Air Filters department at Lowes.com
![Nordic Pure 20x25x5 MERV 12 Pleated Honeywell Replacement AC Furnace Air Filters 2 Pack : Amazon.co.uk: Home & Kitchen Nordic Pure 20x25x5 MERV 12 Pleated Honeywell Replacement AC Furnace Air Filters 2 Pack : Amazon.co.uk: Home & Kitchen](https://m.media-amazon.com/images/I/71Y6WpkMUZL.jpg)
Nordic Pure 20x25x5 MERV 12 Pleated Honeywell Replacement AC Furnace Air Filters 2 Pack : Amazon.co.uk: Home & Kitchen
![Filtrete 20x25x5 Air Filter MPR 1550 DP MERV 12, Healthy Living Ultra Allergen Deep Pleat, 1-Pack, Fits Lennox & Honeywell Devices (exact dimensions 19.56 x 24.19 x 4.69) : Amazon.co.uk: DIY & Tools Filtrete 20x25x5 Air Filter MPR 1550 DP MERV 12, Healthy Living Ultra Allergen Deep Pleat, 1-Pack, Fits Lennox & Honeywell Devices (exact dimensions 19.56 x 24.19 x 4.69) : Amazon.co.uk: DIY & Tools](https://m.media-amazon.com/images/I/81otw-ejzBL._AC_UF894,1000_QL80_.jpg)
Filtrete 20x25x5 Air Filter MPR 1550 DP MERV 12, Healthy Living Ultra Allergen Deep Pleat, 1-Pack, Fits Lennox & Honeywell Devices (exact dimensions 19.56 x 24.19 x 4.69) : Amazon.co.uk: DIY & Tools
![Filtrete 14x36x1 Air Filter MPR 1500 MERV 12, Healthy Living Ultra Allergen, 6-Pack (Exact Dimensions 13.81x35.81x0.78) : Amazon.co.uk: DIY & Tools Filtrete 14x36x1 Air Filter MPR 1500 MERV 12, Healthy Living Ultra Allergen, 6-Pack (Exact Dimensions 13.81x35.81x0.78) : Amazon.co.uk: DIY & Tools](https://m.media-amazon.com/images/I/814e2bmeFQL._AC_UF894,1000_QL80_.jpg)
Filtrete 14x36x1 Air Filter MPR 1500 MERV 12, Healthy Living Ultra Allergen, 6-Pack (Exact Dimensions 13.81x35.81x0.78) : Amazon.co.uk: DIY & Tools
![HDX 24 in. x 36 in. x 1 in. Superior Pleated Air Filter FPR 9, MERV 12 HDX1P9-012436 - The Home Depot HDX 24 in. x 36 in. x 1 in. Superior Pleated Air Filter FPR 9, MERV 12 HDX1P9-012436 - The Home Depot](https://images.thdstatic.com/productImages/8575e8e9-1e54-45e0-87de-ea81586a3a49/svn/hdx-air-filters-hdx1p9-012436-64_600.jpg)
HDX 24 in. x 36 in. x 1 in. Superior Pleated Air Filter FPR 9, MERV 12 HDX1P9-012436 - The Home Depot
![Filtrete 12-in W x 20-in L x 1-in 12 MERV 1500 MPR Allergen, Bacteria and Virus Electrostatic Pleated Air Filter in the Air Filters department at Lowes.com Filtrete 12-in W x 20-in L x 1-in 12 MERV 1500 MPR Allergen, Bacteria and Virus Electrostatic Pleated Air Filter in the Air Filters department at Lowes.com](https://mobileimages.lowes.com/productimages/6c354466-8640-4d35-a87f-67f55d8378cb/16423049.jpg)