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

filter slot   Dan filter slot

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Heelguard slot channel with floor drain lowered siphoned outlet and removable filter basket in stainless steel  FilterLock can be used with any 1 in air filter to improve indoor air quality and reduce energy consumption The patented, 1-size-fits-all product

quick hit super wheel slot machine 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 Variable Neutral Density Filter designed to fit in 1 slot of most matte boxes It is constructed using two 138mm circular polarizers One of the