§29.1105 Induction system screens

If induction system screens are used: (a) Each screen m ust be upstream of the carburettor; (b) No screen m ay be in any part of the induction system that is t he onl y passage t hrough which air can reach the engine, unless it can be deiced by heated air; (c) No screen m ay be dei ced by alcohol alone; and (d) It m ust be im possible for fuel to strike any screen.