Triumph TR6 Scuttle Vent Lid
All commission nos. CP/CC models; 1969 to 1972.
Closing the vent lid (on cars so fitted) when the car is not in use will stop a lot of both water and debris from getting into the plenum. This is obviously not an option on cars with the plastic vent grille, but to assist in preventing debris from entering the plenum area on these cars, an accessory fine metal gauze (part number 722849X) may be fitted in the scuttle aperture under the vent grille.
There is another advantage to be gained from keeping the plenum area of the bulkhead clear. First time out in hot weather, you turn on the heater fan to cool the car interior. Don't you just hate the ticking of the fan, closely followed by the fascia air vents spitting forth at face level a potpourri of chopped leaves and insect bodies!