External Air Roof Equipment

No services such as hvac distribution ducts air handlers plumbing or fire sprinkler systems should be located external to the air barrier.

External air roof equipment.

Thus the york curb does not include a counter fl ashing receiver. Air barriers are systems of materials designed and constructed to control airflow between a conditioned space and an unconditioned space. There are rooftop packed units with either electric heating or gas fired heating. Electrical wiring diagrams for air conditioning systems continued.

Never attach roof ashing directly to a york rooftop unit. Vented roof assembly roof insulation thermal resistance depth at trus heel roof perimeter should be equal or greater to thermal resistance of exterior wall. Displaced equipment can puncture and tear roof coverings thus allowing water to leak into the building. Note the air barrier continuity where the wall meets the roof.

The purpose of these guidelines which cover curb and roof penetrations and sealings is to set forth good construction practices. Rooftop packaged units can be classified according to the type of heating they supply. These are not heating systems but do reduce heat losses from the building. An air to air heat exchanger generally installed in a roof space recovers heat from the internal air before it is discharged to the outside and uses that heat to warm the incoming air.

The air barrier system is the primary air enclosure boundary that separates indoor conditioned air and outdoor unconditioned air. Rooftop equipment frequently becomes detached from rooftops during hurricanes. Equipment blown from a roof can damage buildings and injure people. York does not provide roof system materials required in the fl ashing of a structural member through a roof deck.

Water can enter the building at displaced equipment see figure 1. In order to use an antenna your television must have a built in tv tuner or you must have an external tuner connected to the antenna and television. 1 300 roof ventilation ratio. Roof mounted outdoor air conditioner equipment as developed and agreed upon by the air conditioning heating refrigeration institute ahri and air conditioning contractor s national association inc.