HomeMade air intake filter cut from roll of polyester fluff material with scissors.
Effective filter area 12.5 square inches.
Filter rating approximately MERV 2 to 3 will strain out insects, large particles
Requires service every 60-90 days or filter becomes blocked and airflow stops.
All installers warn that service is required every 60-90 days
With no airflow, radon is no longer diluted and radon reverts to original elevated pre-mitigation level.