@JimRosenthal4 Is it worth putting a MERV8 outside the MERV13 to collect large dust and (maybe?) make the MERV13 last longer, or would the pressure drop and added cost not be worth it?
@JimRosenthal4是否值得在MERV13外放置一个MERV8来收集大量灰尘和（可能？）灰尘让MERV13持续更长时间，否则压降和增加的成本不值得吗？