JH
ANKARBOARD
ACOUSTIC BOARD
1/2′′ or 3/4′′ porous perforated Ankarboard in widths of 300 mm, 400 mm, 12′′ and 16" and in lengths up to about 16' as shown below.
300 mm and 12" widths
with longitudinal ship-lap and
groove
Lengths
2266 mm abt. 7′ 5′′ 3112 mm 10' 2' 3676 mm 12′′ ′′ 4240 mm 13' 11* 4804 mm IS′ 9′′
with ship-lap and groove also at the ends
Lengths
602 mm abt. 2' 1166 mm 3′ 10′′ 1730 mm 5' 8" 2294 mm 7′ 6′′
400 mm and 16′′ widths
with longitudinal ship-lap and groove
Lengths
2337 mm abt, 7′ 8′′ 3111 mm 10" 5" 3885 mm 12′ 9′′ 4272 mm 14′′ 5046 mm 16′ 61⁄2"
When the boards are fixed, they over- lap each other by 5 mm (approx. 3/16”). The grooves cut along the sides allow the perforated sheets to form decorative geometrical patterns. By virtue of their length these boards are very easily fixed, and when in position provide an ex- tremely attractive surface.
Packed 8 sheets to the crate.
* X
120
110
100
90
80
70
60
50
40
30
20
10
with ship-lap and groove also at the ends
Lengths
817 mm abt. 2′ 8′′ 1204 mm 3′ 111⁄21⁄2" 1591 mm 5'2′′ 1978 mm 6′ 6′′ 2365 mm 7*9*
"FA" quality-unpainted "FAM" quality supplied treated with a white
washable paint,
OH YES
NOISELESS
Sound absorption coefficient
for perforated acoustical tile
of wood fibre as shown in figure.
Measurements after
the reverberation time method. Absorption coefficient calculated after the Norris-Eyring formula
T= 0,161
•
– S log (1-x)
Volume of test room 86 m
Sample area 5,76 mi
2
J
The tiles mounted on 1′′ laths
Size of tiles 30 × 30 em 20 × 20 holes.
40
B 100 H:
2
3
4 5.
$ 1000 Hz 2
Frequency
3
4 5
8 10 kH2
SVENSKA
CELLULOSA AKTIEBOLAGET
SUNDSVALL · SWEDEN
THE HONG KONG & FAR EAST BUILDER
VOLUME 14, NUMBER 6
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