Intent 1:
To limit the probability of an inability to clear
blocked or damaged screens, which could lead to:
- a reduction in exhaust air volume, which could lead
to inadequate ventilation, which could lead to the inadequate control
of:
- relative humidity, which could lead to condensation,
which could lead to the growth of mould and mildew, or
- airborne pollutants, or
- for outdoor air intakes, the depressurization of occupied
space from which air is being exhausted, which could lead to the entry
of combustion products from fuel-fired appliances into the building.
This is to limit the probability of negative effects on
the air quality of indoor spaces, which could lead to harm to persons.