What is the minimum clearance required from the top of a boiler with manholes to the ceiling or overhead construction?

The minimum clearance required from the top of a boiler with manholes to the ceiling or overhead construction is 3 feet. This requirement ensures adequate space for maintenance, inspection, and safe operation of the boiler. Manholes allow for access to the interior of the boiler for cleaning and repairs, and having sufficient clearance above prevents any obstruction that could hinder these activities. Additionally, this distance helps facilitate the safe operation of the equipment by providing enough room for any potential overhead obstructions and promoting ventilation around the boiler. Maintaining this clearance also minimizes the risk of accidental contact with the overhead structure during routine maintenance or servicing tasks, contributing to overall safety in the mechanical space.