Where should a manual gas cock valve shutoff be installed in relation to a furnace?

The manual gas cock valve shutoff should be installed external to the furnace to ensure safety and accessibility. Positioning the valve outside the furnace compartment allows for easier access during emergencies, maintenance, or repairs. This critical safety feature enables personnel to quickly shut off the gas supply if there is a malfunction or other hazardous situation, reducing the risk of gas leaks or explosions.

In contrast, placing the valve within the furnace compartment could pose risks if it becomes difficult to reach during an emergency or if a problem arises within the furnace itself. Keeping the valve external enhances overall safety by ensuring that users are not exposed to the hazards associated with the furnace while trying to operate the valve.