Current Energy Leakages in Egyptian Buildings - Energy Efficiency in the Urban Environment - page 225

TABLE 9.5
Warm Air Furnaces and Combustion Warm Air Furnaces/Air-Conditioning Units,
Warm Air Duct Furnaces and Unit Heaters

Subcategory
or Rating
Condition

Size Category
(Input) e

Test
Procedure b

Minimum
Eficiency Equipment Type

Warm air furnace, gas fired
(outdoor installation)

<65.9 kW DOE 10 CFR

Part 430 or
ANSI Z21.47

78% AFUE
or 80% E t a

Maximum
capacity d >65.9 kW ANSI Z21.47 80% E c c

Warm air furnace, gas fired
(indoor installation)

<65.9 kW DOE 10 CFR

Part 430 or
ANSI Z21.47

90% AFUE
or 92% E t a

Maximum
capacity d >65.9 kW ANSI Z21.47 92% E c a

Warm air furnace, oil fired
(outdoor installation)

<65.9 kW DOE 10 CFR

Part 430 or
UL 727

78% AFUE
or 80% E t a

Maximum
capacity c >65.9 kW UL 727 81% E t a

Warm air furnace, oil fired
(indoor Installation)

<65.9 kW DOE 10 CFR

Part 430 or
UL 727

90% AFUE
or 92% E t a

Maximum
capacity c >65.9 kW UL 727 92% E t a

Warm air duct furnaces, gas
fired (outdoor installation)

All capacities Maximum

capacity c

ANSI Z83.9 80% E c a

Warm air duct furnaces, gas
fired (indoor installation)

All capacities Maximum

capacity c

ANSI Z83.9 90% E c a

Warm air unit heaters, gas
fired (indoor installation)

All capacities Maximum

capacity c

ANSI Z83.8 90% E c a

Warm air unit heaters, oil
fired (indoor installation)

All capacities Maximum

capacity c

UL 731 90% E c a

Note: a. Efficiencies: Et = thermal efficiency. Ec = combustion efficiency. b. Units shall also
include an interrupted or intermittent ignition device, have jacket lasses not exceeding
0.75% of the input rating and have either power venting or flue damper. c. A vent
damper is an acceptable alternative to the fuel damper for those furnaces where
combustion air is drawn from the conditioned space . d. Combustion units not covered
by NAECA (3-phase power or cooling capacity greater than or equal to 19.0 kW) may
comply with either rating. e. Minimum and maximum ratings as provided for and
allowed by the unit's controls.

concentrations assumptions and target concentrations shall be shown in the
design documents. Outdoor air CO 2 concentrations shall be determined by
one of the following:

1. CO 2 concentration shall be assumed to be 400 ppm without any
direct measurement.

2. CO 2 concentration shall be dynamically measured using a CO 2 s e n s or
located near the position of the outdoor air intake.