In an attic or in a furred space in which a warm air funace is installed shall be accessible by an opening and passage way of no less than ____ inches by _____ inches continuous from the opening into the furnace and to it` s controls.

In an attic or in a furred space in which a warm air funace is installed shall be accessible by an opening and passage way of no less than ____ inches by _____ inches continuous from the opening into the furnace and to it` s controls.