Product review (4 stars): Excellent product
Pros:
custom fit. I put it into a Viking hood that just had grease traps and was meant for external venting - now I can vent into the kitchen
Good instructions.
Quality construction
Thick filter

Cons:
You will need patience but it only took ten mins to put together in the end

I needed two sets - measure before you order

Honestly it's a great product and will save you a ton on branded filters. I highly recommend this one!