THA/THF Roof Terminals

General

EXHAUSTO roof terminal THA is designed for air exhausts and THF is designed for outdoor air intakes for mechanical ventilation systems.

Their design ensures a good technical solution with minimal pressure drop.

NB: THA/THF do not satisfy Fire Standard DS428, which requires 50 mm of insulation in the roof penetration.

Technical description

THA/THF Technical description

Materials
External scroll	Hot-galvanised sheet, black lacquer RAL7021
Insulation	5 mm polyethylene foam (to prevent condensation)
Support fixture	A support fixture for fixing under flashing is available for extra payment. Warranty is void If the support fixture is not used in accordance with the instructions.

Flashing
Without flashing	Where roof terminals are supplied unpainted
PERFORM	Standard black PERFORM Grey and red are available on extra payment
Zinc	Used for mounting under roofing felt

THF

The THF roof terminal is for outdoor air intakes with a round inlet, giving minimal pressure drop. It has an integral bird net.

THA

The THA roof terminal is for exhaust air. The large free space ensures a low pressure drop, even where air volumes are large. It has an integral bird net.

Dimensional drawing

THA/THF Dimensions table

Dimensions E, F and G apply only to PERFORM flashing.
With zinc, the flashing is always 100 mm.

PERFORM flashing can cater for +/- 2.5° relative to the given roof pitch.

A dimension varies according to degree dimension. C = adapter size.

THA THF målskitse

Sizes	L1 mm		H mm	C mm	C2 mm	Weight, kg
Sizes	0-35°	36-60°	H mm	C mm	C2 mm	Weight, kg
THA160	707	892	160	Ø160	Ø280	5
THA200	762	987	160	Ø200	Ø350	7
THA250	869	1144	190	Ø250	Ø440	9
THA315	995	1337	220	Ø315	Ø550	13
THA400	1172	1422***	250	dia. 400	Ø680	23
THA500	1208*	1458**	290	dia. 500	Ø850	30
THF160	732	917	160	Ø160	Ø280	5
THF200	787	917	160	Ø200	Ø350	7
THF250	894	1169	190	Ø250	Ø440	9
THF315	1020	1369	220	Ø315	Ø550	13
THF400	1197	1447***	250	dia. 400	Ø680	23
THF500	1233*	1483**	290	dia. 500	Ø850	30

*0-30° **31-50° *** max 50°

Angle v	E	F	G
0° < v ≤ 2°	100	100	100
2° < v ≤ 60°	250	300	250

Pressure drop

THA/THF Pressure drop

THA - Exhaust air

THA trykfald

P_t = total pressure drop
Temperature: t = 20°C
Density ℓ = 1.2 kg/m³

THF - Outdoor air intake

THF trykfald

P_t = total pressure drop
Temperature: t = 20°C
Density ℓ = 1.2 kg/m³

Flue gas resistance

THA/THF Flue gas resistance

If the duct system has smoke ventilation, e.g. in apartment buildings, flue gas resistance in the duct system must be calculated from the following diagram.

The diagram shows smoke gas resistance.

THA THF røggasmodstand