Residential mechanical and electrical units for the plan set: furnaces, air handlers, AC condensers, thermostats, ceiling fans and smoke detectors. The equipment pieces carry the footprints a mechanical closet has to be sized around.
7 blocks in 4 families. DXF R2018, drawn in inches.
Seven blocks cover the mechanical and electrical pieces a house plan set has to locate: a furnace, an air handler, an AC condenser, a thermostat, a ceiling fan, a smoke and CO detector, and a hose bibb. On a small residential job the designer draws them on the floor plan and a combined MEP plan, the furnace, air handler and condenser on M-HVAC-EQPM, the thermostat on M-HVAC or E-POWR, the fan on E-LITE, the detector on a fire-alarm layer, and the hose bibb on P-FIXT.
The equipment pieces are true footprints, because a mechanical closet is sized around them. The furnace is 24 x 30 in, the air handler 24 x 48 in and the condenser a 30 in square pad. The IRC requires working space in front of the control side of an appliance, at least 30 in deep, and an attic installation needs a clear passage and a platform to it. Outdoor condensers need a disconnect within sight under NEC 440.14 and clearance around the coil per the manufacturer; leave space between the pad and the house and between units.
Smoke alarms are the one plan check almost every reviewer runs. IRC R314 requires one in each sleeping room, one outside each separate sleeping area in its immediate vicinity, and one on each story including basements; carbon monoxide alarms are required outside sleeping areas when there is a fuel-burning appliance or attached garage. The detector block is a 6 in circle, mounted on the ceiling at its center.
Where they go matters more than the symbol. Put the thermostat on an interior wall away from supply registers, windows and direct sun. The ceiling fan inserts at its center, 52 in by default, which is also the box location; center it in the room or over the seating group, and keep the blade circle clear of light fixtures. The hose bibb inserts at its wall point and needs backflow protection, usually a vacuum breaker, under both plumbing codes.
All seven are free downloads in DXF, DWG or PNG, and they can be placed in the CADdillo browser editor at app.caddillo.com without desktop CAD.
Plan-view footprint in inches. Each name opens the block's section on its family page, with DXF, DWG and PNG downloads.
| Block | Footprint (in) | Family |
|---|---|---|
| AC Condenser Unit | 30 x 30 | HVAC Equipment CAD Blocks |
| Air Handler | 24 x 48 | HVAC Equipment CAD Blocks |
| Ceiling Fan | 52 x 52 | Light Fixture, Ceiling Fan and Lamp CAD Blocks |
| Furnace | 24 x 30 | HVAC Equipment CAD Blocks |
| Hose Bibb | 4 x 3 | Porch, Deck and Patio CAD Blocks |
| Smoke / CO Detector | 6 x 6 | Fire Alarm and Extinguisher CAD Blocks |
| Thermostat | 8 x 8 | HVAC Equipment CAD Blocks |
IRC R314 requires smoke alarms in each sleeping room, outside each separate sleeping area in the immediate vicinity of the bedrooms, and on every story including basements. Carbon monoxide alarms are required outside sleeping areas in homes with fuel-burning appliances or attached garages. The detector block is a 6 in ceiling-mounted circle.
Start from the equipment footprint: the furnace block is 24 x 30 in and the air handler 24 x 48 in. The IRC then requires a working space in front of the control side, at least 30 in deep, and the closet door must be wide enough to remove the largest piece. Check the manufacturer's side clearances too.
The condenser block is a 30 in square pad, adjustable from 24 to 42 in to match the unit. It inserts at the pad's near-left corner. Leave the manufacturer's coil clearance to the house and to any second unit, and show a disconnect within sight of the equipment as NEC 440.14 requires.
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