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(8) Whenever'r the excavation exceeds twelve (12) inches, or Water seepage is apparent under the house, a watertight pan or con- crete pit shall be used. The pan shall be made of not less than twenty-four (24) gauge galvanized iron or sixteen (16) ounce copper. The pan shall be suitably anchored in place, and the- wa l_ls shall ex- tend at least four (4) inches above the ground level, with eight (8) Inch clearance on all sides except the control side which shall ha -we eithteen (18) inch clearance. (9) Adequate provisions shall be made for easy access to the furnace under the house by means of an opening in the foundation wall. VENTS SECTION a. (1) X111 vent pipes for floor furnaces and central heating furnaces must be of standard galvaniz(%d iron of not less than twenty- six (26) gauge or. approved Type "B" vents. (2) The: joints of the galvanized vent pipe shall be secured together with metal screws, rivets, or approved clamps. (3) Every vent pipe or connection between the appliance and the chimney or flue shall not bo smaller than the size indicated by the vent collar of the appliance, and in no case shall the internal area be less than seven (7) square inches (three inch pipe). Vent pipes leading from he -ting appliances for fuel other than gas, when converted to gas fuel, may be rcducod from original size on the basis of one (1) square inch of area for evory 7,500 B.T.U. delivered to the appliance burner. (Li_) Where the appliance has more than one vent connection, or where more than one appliance is connected to the same vent, the vent pipe shall equal the combined area of the vents for which it acts as a common carrier to the flue. 1.11 connections to the lateral run shall be made with "Y" connections (5) till vents shall extend through roof as near ridge as practicable with laterals in the attic not less than thirty degrees from the horizontal. (6) Heights must be two (2) feet above the highest portion of any structure within ten (10) foot of where the vent extends above the ridge. (7) The installation of a cap or other devices on the out- let of an appliance vent, which in any way obstructs the free passage of the products of combustion to the outside atmosphere, is prohibited. (8) Vent pipes passing through any closet or other enclosed space used for the storage of clothing, household goods, or other com- bustible materials shall be Type "B" vents or virtreous lined masonry chimney. (9) Maximum length of lateral vents shall not be more than seventy-five percent (75%) or vertical height of vent or chimney. (10) .4111. lateral vent pipes shall be supported at every joint by perfors.ted strap iron not less than one sixteenth (1/16) inch in thickness securely fastened to the floor joists. (11) Vent pipes shall not be closer than two (2) inches to any combustible material, and in all cases where vent pipes are less than four (4) inches from any combustible material, the same shall berotectcd with asbestos mill board of not less than one quarter (1/4 inch thickness. (12) Where Typo "B" vents are used, it shall not be necessary to us the mill board as hereinbeforo provided. (13) In underfloor areas, the minimum pitch upward of lateral runs of vents from the appliance must be at loast one half(1/2)inch per foot. -8-