The invention includes methods of forming metal-containing layers. The drive means moves the movable grating through yieldable connection when moving toward CLOSED position, whereby when such movement is blocked by a foreign object the movable grating stops without damaging the object or the drive. According to one embodiment of the present invention, the emergency call is enabled. and a retention time of 10 to 240 minutes at a rate of polymerization of 80% or more. Each radiator of the at least one radiator is associated with at least one passage having an entry end in communication with one surface of the radiator and an exit end adjacent the entry end of one duct of the ducted fans.