Question

grills and wiremeshing on doors

Answer 1

at 250/sq feet.....that's the starting rate

they are basically done to keep away anyone provided ventilation in handy.

Anyway i am not sure what you've asked here so the points are totally based on assumptions .

:)

Answer 2

$\large\boxed{\fcolorbox{blue}{red}{Correct Question }}$

Give scientific reasons :

Grills of doors and windows are always painted before they are used.

$\large\boxed{\fcolorbox{blue}{yellow} {Answer}}$

1. Grills of doors and windows are made from iron.

2. Iron has a tendency to undergo corrosion.

3. Paint does not allow air or moisture to come in contact with iron surface.

Therefore, to prevent rusting of iron, grills of doors and windows are always painted before they are used.

Hope it helps!

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