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Islington London renovation.

DIY Merv11 air purifier.

If anyone in your family has home born allergies you can simply make one of these.

Materials.
1 20” box fan
4 20”x20” Merv11 filters. (Use Merv12 if you can find them)
Roll of duct tape
Cardboard for the base (I used the cardboard the fan came in).

Tape the 4 filters together making sure the air flow arrows point in.
Cut and tape cardboard to box dimension
Tape your fan to the top of the box
Replace filters every 4-6 months.