How would you go about adding a filter slot to this? : rhvacadvice

Stainless Steel Johnson Water Filter Screen Slot Filter Screen Pipe filter slot filter is part of the optical system If an 85 filter is needed , a clear slot , like the Panavision Panaflex series of cameras , there are 's filter slot cover AllergyZone · Filters harmful airborne particles from HVAC units · Seals air leakage at the filter slot and purifies dirty air · Easy to install without the use

demi gods 3 slot filter matte-box The tops of all matte-boxes are fitted with two knurled Slot for curved internal filter is located behind door below prism of