kuch jahil mechanic jasy T-valve remove karty hen, wasy hi ye b remove kar daty hen, behter feul avg chaiye to conect karwa lo 50-100 se ziyada ka kharcha nai hai, compay recommend karti hai, or jo FF cng gariyan i hen un main ye pipe connected hen ,,,,,,, sardi hai to ac k pipe utar do garmi hai to fan direct karwa lo thermostat valve utar do, ye sub jahil mechanics ki dramybazi hai,