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Wide angle L-lenses typically have a gelatin filter holder on the mounting point of the lens, which allows the photographer to cut a small,

Image: A blue air filter sticks out of it's home in a furnace You Like measuring the filter itself, the air filter slot will measure out to

filter slot cover 3 Answers 3 Those gaps are normal and don't usually cause a problem When the furnace is running the air pressure forces the filter against

qqindah slot Heelguard slot channel with floor drain lowered siphoned outlet and removable filter basket in stainless steel