Looking for two pieces of window screen at least 1ft x 1ft

Or one piece at least 1ft x 2ft

Preferably in fibreglass (not aluminum) as in the attached photos.

If anyone has some leftover, I would appreciate not having to buy a full kit with spline and roller, which would go to waste with most of the screen roll.

In case you’re wondering why I need these:
I’m seeing wasps inside my house for the past two weeks and I don’t know where they’re coming from. My house is fully sealed with spray insulation and caulk. The only places I can think of are the bathroom vents or gas fireplace. I already ran the fireplace, so I’m sure they would be dead if they were in the chimney. So, I decided to put mosquito screens on the back of my bathroom fan vent covers to eliminate that possibility, in case the exterior flap is not shutting completely.

WINDOW SCREEN: 2 pieces of 1’ x 1’ (Baseline and Beaumaris)