The filter keeps coming off whenever I run the vent due to the vibration, does any one have a solution to keep the filter in place?

I found it very difficult to snap the filter in place in the first place. Once you do though it seems quite secure. If it's fully seated and snapped in.

Do i need these filters if i am installing the hood with duct work?

No, the filters are only used if unit is used as a recirculating fan. If you duct an exhaust vent you do not need the filters.

Will this filter work for cosmo qs75 30-in under-cabinet range hood 900-cfm?? the cfk5 (they suggest) is out of stock.

CALL COSMO CUSTOMER SERVICE - THEY ARE TERRIFIC.

Which side should the filter be facing downwards?

Thank you for your question. In the middle of the filter on one side, you will see three slots where the notches on the range hood will slide and lock into. That should be pointed upwards, and the felt-like side should be facing downwards. I hope this helps!

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Description

Replaceable filter captures and minimizes kitchen odors for cleaner air. Allows for under cabinet range hood to be used as recirculating and non-ducted. Maintains range hood's design without modifications.
Made from quality activated charcoal for better odor absorption and removal.
Replace every 6 months or more frequently depending on use. Easy tool-free installation. Twists and locks into place inside the range hood.
For use with the following Model Numbers: COS-5MU30, COS-5MU36

Charcoal Carbon Filters for ductless ventilation. Made from high quality materials to provide longest usage possible. Includes one charcoal filter, which lasts 6 months based on normal usage.

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Brand	Cosmo
Model	5MU30-CFK4
Product Dimensions	17.78 x 17.78 x 2.54 cm; 240 g
Part Number	Filter
Compatible Devices	cooker hood
Material Type	Carbon Fibre
Included Components	Carbon Filter Kit
Batteries included?	No
Batteries Required?	No
Item Weight	240 g

Cosmo Range Hood Filter Genuine Filter(s) (5MU30 / 5MU36 Filter - CFK4)

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