Top ventilation for top chefs

Pyramid

The Pyramid out blowing hood is designed specifically for out blowing the exhaust air on the roof of the buildings.

Pyramid roof hood blows exhaust air upwards with a high velocity and small pressure loss. The unique product structure of the Pyramid includes an outer shell, airflow baffles and top cover. It’s unique construction prevents water penetrating into the duct system, even when the ventilation is sometimes turned off. Pyramid has also very low construction, what makes it difficult to detect.

DIMENSIONS

SizeABCHø DEAir flow ratePressure lossWeight
 200420240180335212-220-400 l/s40-120 Pa10 kg
 250420240180335262-300-550 l/s40-120 Pa10 kg
 315670390220465327 -500-1000 l/s40-120 Pa15 kg
 400670390220465 - 400750-1300 l/s40-120 Pa15 kg
 500840490250550 - 500900-1500 l/s35-90 Pa30 kg
 6301055615290660 - 6301500-2100 l/s40-90 Pa50 kg
 8001340780330810 - 8002100-3800 l/s40-120 Pa70 kg
 10001675975380980 - 10003800-5500 l/s40-90 Pa100 kg
1250209512204501220 - 12505500-9000 l/s50-120 Pa150 kg

Pyramid is supplied as standard with a rectangular duct connection and is very easy to install.
The round connection is available up to ø800.

TECHNICAL INFORMATION

Pressure loss and sound data 

Effect of distance on sound pressure level

5 m sound pressure level decreases 7 dB(A)
10 m sound pressure level decreases 23 dB(A)
15 m sound pressure level decreases 29 dB(A)


Velocity of out blowing

Duct sizek
 ø200 0.092
 ø250 0,120
 ø315 0,252
 400x400 0,304
 500x500 0,548
 630x630 0,852
 800x800 1,380
 1000x1000 2,120
1250x1250 2,880

Formula for the velocity of out blowing:

v= velocity of out blowing, m/s
d= duct diameter, m
p= total pressure loss, Pa
k= coefficient

The airs out blowing rate at the rectangular channel can be calculated using the same formula.


Sound attenuation
Sound attenuation, dB by octave bands (63-8000 Hz) ISO 7235

Size631252505001000200040008000
 400 2 3 1 2 1 1 1 3
 500 1 2 1 2 1 1 1 3
 630 1 1 1 1 2 1 1 2
 800 1 1 1 1 2 1 1 2
 1000 1 1 2 1 1 1 1 2
 1250 1 1 1 1 1 1 1 2

Brochures

  • Pyramid Out Blowing Hood

    Product Brochure

Product code

PYRAMID1000 MA KL

The standard material for the Pyramid is Magnelis®. It is also available in stainless steel (RST).

Priming with acid primer, top shell (RAL colors) two-layer, anti-rust pigmented polyurethane 2-component paint.

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