SpeciÞcations: Automatic Melt-out Heat and Smoke Vents shall be FM approved single glazed Model 417-D (model 418-D double glazed) as manufactured by Plasteco, Inc. Houston, Texas. (800-231-6117, Fax 713-453-8372). 

Units shall have a 12 inch high double wall insulated aluminum curb. Inner and outer frames shall be mill Þnish 6063-T5 extruded aluminum. Glazing shall be white translucent acrylic designed to withstand a 40 psf snow load. (Model 418-D double glazed unit add the words Òinner pyramid shall be of a clear acrylicÓ).

Fall protection as required by OSHA Regulation ¤ 1926.501 ÒDuty to have Fall ProtectionÓ  shall be provided by FALLGUARDª Skylight Screens. FALLGUARDª Skylight Screen shall be shipped separately and installed prior to the installation of the melt-out heat and smoke vent.

Add Alternate Ð Hail Stone Screens shall be 1Ó x 1Ó x .063Ó galvanized welded wire mesh overlaid onto the FALLGUARDª Skylight Screens. Screens shall have been tested to resist without permanent deformation, the impact energy of a 2" diameter hail stone (22ft lbs) as required by FM.