In my growroom(s) Mylar is a waste. Despite what has always been a hard and fast rule...I'd sooner use foil than Mylar, but flat white paint is the one-time solution I use. (never needs to be replaced)

Here's my clone/seedling/veg/re-veg closet. This is half of my 4 x 2 clothes closet. The other half of the closet has two clothes rods...one high, one low. Same ammount of hangars as a normal closet, lol.

I don't use scrubbers or filters, but I'm in a situation where it's not necessary.