HP Dc7900 dc7900 Circulated or preheated air, Matter can block the vents and limit the airflow

QuickSpecs

HP Compaq dc7900 Business PC

Technical Specifications

Unit Environment and Operating	Ultra-slim Desktop		Small Form Factor	Convertible Minitower
Conditions
General Unit Operating Guidelines
Keep the computer away from excessive moisture, direct moisture and the extremes of heat and cold, to ensure that unit is
operated within the specified operating range.
Leave a 10.2 cm (4 in) clearance on all vented sides of the computer to permit the required airflow.
Never restrict airflow into the computer by blocking any vents or air intakes.
Do not stack computers on top of each other or place computers so near each other that they are subject to each other's re-
circulated or preheated air.
Occasionally clean the air vents on the front, back, and any other vented side of the computer. Lint, dust and other foreign
matter can block the vents and limit the airflow.
If the computer is to be operated within a separate enclosure, intake and exhaust ventilation must be provided on the enclosure,
and the same operating guidelines listed above will still apply.
Temperature Range		Operating: 50° to 95° F (10° to 35° C)*
	Non-operating: –22° to 140° F(–30° to 60° C)
Relative Humidity	Operating: 10% to 90% (non-condensing at ambient)
	Non-operating: 5% to 95% (non-condensing at ambient)
Maximum Altitude (unpressurized)			Operating: 10,000 ft (3048 m)
		Non-operating: 30,000 ft (9144 m)

*Operating temperature is de-rated 1.0 deg C per 300 m (1000 ft) to 3000 m (10,000 ft) above sea level, no direct sustained sunlight. Maximum rate of change is 10 deg C/Hr. The upper limit may be limited by the type and number of options installed.

Power Supply	Ultra-slim Desktop	Small Form Factor	Convertible Minitower
Standard Efficiency	N/A	240W standard efficiency	365W standard efficiency
		active PFC	active PFC
Energy Efficient	135W 87% efficient	240W 85% efficient	365W 85% efficient
	active PFC	active PFC	active PFC
	(external)
Operating Voltage Range	90 – 264 VAC	90 – 264 VAC	90 – 264 VAC
Rated Voltage Range	100 – 240 VAC	100 – 240 VAC	100 – 240 VAC
Rated Line Frequency	50/60 Hz	50/60 Hz	50/60 Hz
Operating Line Frequency Range	47 – 63 Hz	47 – 63 Hz	47 – 63 Hz
Rated Input Current	N/A	4A	6A
Rated Input Current with Energy	1.5A	3.5A	5A
Efficient* Power Supply
Current Leakage	< 275 µA	< 275 µA	< 450 µA
(NFPA 99)
System Heat Dissipation	N/A	Typical 198 btu/hr	Typical 222 btu/hr
		(50 kg-cal/hr)	(56 kg-cal/hr)
		Maximum 1260 btu/hr	Maximum 1916 btu/hr
		(318 kg-cal/hr	(483 kg-cal/hr)
System Heat Dissipation	Typical 133 btu/hr	Typical 150 btu/hr	Typical 171 btu/hr
with Energy Efficient* Power	(33.5 kg-cal/hr)	(38 kg-cal/hr)	(43 kg-cal/hr)
Supply	Maximum 549 btu/hr	Maximum 1024 btu/hr	Maximum 1557 btu/hr
	(132 kg-cal/hr)	(258 kg-cal/hr)	(392 kg-cal/hr)
	Ultra-slim Desktop	Small Form Factor	Convertible Minitower
Power Supply Fan	N/A	80mm variable speed	92mm variable speed

DA - 13029 Worldwide QuickSpecs — Version 9 — 1.9.2009 Page 21