AKUSTIpan SL Acoustic Panel

Name: AKUSTIpan SL Acoustic Panel
Brand: BVS Akustik

AKUSTIpan SL

NRC 0.55–0.95

WallCeiling

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Manufacturer

BVS Akustik

BVS Akustik GmbH & Co. KG from Verl (East Westphalia) has been active in the furniture industry since 1990 and produces custom acoustic panels with CNC saws, purpose-built drilling lines and an in-house laser system. Almost all board materials are processed: solid wood, veneered, composite and decor boards, each cut, edge-finished and lacquered to the customer's specification. The range covers drilled (AKUSTIbohr), micro-perforated (AKUSTIpur), slotted (AKUSTIpan) and sound-absorbing partition elements (AKUSTItrenn), each in numerous hole patterns and build-up depths. The elements are available in fire classes B1 and B2 and, for sports halls, with certified ball-impact resistance. References include Princeton University, NYU and the Emser Therme.

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Documents

Processing guideline Measurement results 3er-Schlitz Measurement results 4er-Schlitz Certificate (formaldehyde-free, NAF)Measurement results 2er-Schlitz 12er/24er Measurement results 2er-Schlitz 16er/32er Measurement results 2er-Schlitz 8er/irreg Measurement results 3er-Schlitz 12er/24er FSC-Certificate (GFA-COC-005281, bis 30.06.2031)

Test report on request

Description

AKUSTIpan SL is the premium slotted acoustic panel from BVS with a linear structure. The fine slotting on the face gives the element a modern, timeless look, while the tongue-and-groove connection between panels produces an almost joint-free appearance and quick, simple installation. Slot widths of 0.08, 0.12 and 0.16 in, grids of 0.31, 0.47, 0.63, 0.94 and 1.3 in and an irregular slotting that reduces the moiré effect can be freely combined with drillings of 0.12, 0.16, 0.31 and 0.39 in on the back. The carrier board can be MDF (NAF), plywood or three-layer board; a wide spectrum of veneers, decors and coatings is available for the surface. Cuts and cut-outs are possible directly on site, and production runs up to a format of 138 x 39 in. The panel becomes acoustically effective through the interplay of the slotting on the face, the drilling on the back and the cavity behind. The absorber can be tuned precisely to each project through the combination of slot width, grid and drilling. Sound absorption is determined in the reverberation room per EN ISO 354 and rated per EN ISO 11654; for design work the full third-octave curve matters alongside the single-number rating.

Technical data

Material: Carrier board: MDF (NAF), plywood or three-layer board; surface optionally with veneers, premium decors or coatings.

Fire class (EN 13501-1): B1 and B2 per DIN 4102 / DIN EN 13501-1

Application: Wall and ceiling cladding in interiors with design ambition.

Measurement data

Sound absorption

Reverberation chamber (ASTM C423 / ISO 354)· 88 variants

Choose the look

Choose the slot pattern · web / slot width in mm

Rear drilling · Ø / pitch in mm, invisible from the front

NRC

0.95

Frequency values

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Cavity	Insulation	Value
7.9 in	1.2 in	NRC0.95
2.8 in	1.2 in	NRC0.90
3.9 in	1.2 in	NRC0.90
2 in	1.2 in	NRC0.85

Test report: 24-000631

NRC: 0.95 (derived from ISO 354 lab data)

Institute: TFI Aachen GmbH

Measurement date: 06/04/2024

Perforation: 13/3 - 10/16

Measured values as a table (88 measurements)

AKUSTIpan SL Acoustic Panel: sound absorption coefficient αs per ISO 354 by frequency and test build-up
Build-up	NRC	100 Hz	125 Hz	160 Hz	200 Hz	250 Hz	315 Hz	400 Hz	500 Hz	630 Hz	800 Hz	1000 Hz	1250 Hz	1600 Hz	2000 Hz	2500 Hz	3150 Hz	4000 Hz	5000 Hz
12/4 - 10/16 · h=2 in · with 1.2 in insulation	0.85	0.20	0.16	0.27	0.36	0.47	0.54	0.74	0.86	0.98	1.04	1.10	1.11	1.09	0.95	0.91	0.85	0.86	0.98
12/4 - 10/16 · h=2.8 in · with 1.2 in insulation	0.90	0.18	0.17	0.37	0.45	0.58	0.68	0.90	1.01	1.03	1.08	1.06	1.05	0.97	0.89	0.86	0.93	0.98	1.01
12/4 - 10/16 · h=3.9 in · with 1.2 in insulation	0.95	0.20	0.26	0.50	0.59	0.76	0.93	0.98	1.05	1.07	1.07	1.04	0.96	0.88	0.90	0.96	0.93	0.92	0.96
12/4 - 10/16 · h=7.9 in · with 1.2 in insulation	0.90	0.39	0.34	0.70	0.84	0.93	1.00	1.05	0.95	0.95	0.81	0.81	0.94	0.94	0.96	0.93	0.98	0.93	1.01
12/4 - 8/16 · h=2 in · with 1.2 in insulation	0.80	0.17	0.14	0.32	0.38	0.49	0.59	0.76	0.83	0.94	1.02	0.99	0.99	0.97	0.88	0.81	0.79	0.83	0.97
12/4 - 8/16 · h=2.8 in · with 1.2 in insulation	0.85	0.23	0.21	0.43	0.48	0.61	0.69	0.83	0.93	0.99	0.99	0.99	0.95	0.88	0.80	0.79	0.83	0.89	0.95
12/4 - 8/16 · h=3.9 in · with 1.2 in insulation	0.85	0.29	0.28	0.54	0.59	0.73	0.87	0.95	0.95	0.99	0.95	0.93	0.88	0.80	0.81	0.85	0.82	0.83	0.89
12/4 - 8/16 · h=7.9 in · with 1.2 in insulation	0.85	0.42	0.37	0.80	0.77	0.82	0.86	0.96	0.93	0.85	0.82	0.78	0.87	0.84	0.84	0.84	0.86	0.85	0.93
13/3 - 10/16 · h=2 in · with 1.2 in insulation	0.85	0.18	0.17	0.29	0.33	0.47	0.58	0.78	0.87	0.94	1.04	1.09	1.10	1.06	0.96	0.86	0.86	0.86	1.04
13/3 - 10/16 · h=2.8 in · with 1.2 in insulation	0.90	0.19	0.20	0.37	0.44	0.58	0.70	0.91	1.02	1.07	1.12	1.08	1.04	0.98	0.89	0.88	0.93	0.97	0.98
13/3 - 10/16 · h=3.9 in · with 1.2 in insulation	0.90	0.29	0.30	0.51	0.57	0.73	0.92	0.97	1.05	1.05	1.07	1.03	0.93	0.86	0.86	0.91	0.91	0.84	0.84
13/3 - 10/16 · h=7.9 in · with 1.2 in insulation	0.95	0.40	0.35	0.80	0.83	0.95	1.02	1.06	0.99	0.94	0.84	0.83	0.96	0.95	0.96	0.94	0.94	0.91	0.96
13/3 - 8/16 · h=2 in · with 1.2 in insulation	0.80	0.18	0.17	0.32	0.38	0.48	0.55	0.77	0.84	0.98	1.00	1.01	1.02	0.97	0.87	0.80	0.77	0.78	0.94
13/3 - 8/16 · h=2.8 in · with 1.2 in insulation	0.85	0.22	0.19	0.41	0.47	0.61	0.69	0.85	0.93	0.98	1.01	0.99	0.97	0.91	0.81	0.78	0.83	0.89	0.94
13/3 - 8/16 · h=3.9 in · with 1.2 in insulation	0.85	0.26	0.27	0.55	0.62	0.76	0.87	0.94	0.99	0.95	0.96	0.91	0.88	0.82	0.81	0.84	0.81	0.83	0.86
13/3 - 8/16 · h=7.9 in · with 1.2 in insulation	0.85	0.39	0.35	0.78	0.80	0.87	0.90	0.95	0.94	0.87	0.77	0.77	0.87	0.84	0.85	0.81	0.81	0.85	0.91
14/2 - 10/16 · h=2 in · with 1.2 in insulation	0.85	0.20	0.16	0.28	0.38	0.49	0.60	0.75	0.86	1.02	1.08	1.12	1.05	0.98	0.84	0.79	0.69	0.72	0.82
14/2 - 10/16 · h=2.8 in · with 1.2 in insulation	0.85	0.21	0.19	0.39	0.47	0.60	0.72	1.00	1.01	1.06	1.10	1.07	0.93	0.87	0.79	0.77	0.84	0.85	0.85
14/2 - 10/16 · h=3.9 in · with 1.2 in insulation	0.90	0.24	0.26	0.49	0.58	0.77	0.96	1.03	1.02	1.03	1.04	0.99	0.90	0.81	0.83	0.87	0.80	0.76	0.78
14/2 - 10/16 · h=7.9 in · with 1.2 in insulation	0.90	0.39	0.32	0.76	0.92	0.88	0.97	1.00	0.96	0.92	0.78	0.80	0.93	0.89	0.88	0.83	0.83	0.80	0.81
14/2 - 8/16 · h=2 in · with 1.2 in insulation	0.80	0.17	0.14	0.31	0.37	0.49	0.61	0.81	0.83	0.97	1.03	1.01	0.98	0.89	0.79	0.72	0.68	0.75	0.87
14/2 - 8/16 · h=2.8 in · with 1.2 in insulation	0.80	0.20	0.17	0.38	0.49	0.61	0.72	0.87	0.96	1.02	0.99	0.97	0.89	0.80	0.75	0.70	0.76	0.80	0.84
14/2 - 8/16 · h=3.9 in · with 1.2 in insulation	0.80	0.30	0.29	0.53	0.61	0.73	0.90	0.92	0.93	0.96	0.95	0.88	0.82	0.75	0.74	0.76	0.75	0.76	0.77
14/2 - 8/16 · h=7.9 in · with 1.2 in insulation	0.80	0.44	0.37	0.73	0.82	0.86	0.89	0.95	0.88	0.87	0.75	0.75	0.80	0.80	0.78	0.77	0.77	0.77	0.79
28/4 - 10/16 · h=2 in · with 1.2 in insulation	0.70	0.17	0.14	0.33	0.36	0.49	0.56	0.78	0.80	0.92	0.93	0.91	0.88	0.79	0.69	0.63	0.60	0.59	0.74
28/4 - 10/16 · h=2.8 in · with 1.2 in insulation	0.80	0.21	0.19	0.46	0.49	0.67	0.72	0.83	0.91	0.92	0.90	0.88	0.80	0.72	0.65	0.64	0.67	0.71	0.81
28/4 - 10/16 · h=3.9 in · with 1.2 in insulation	0.75	0.29	0.28	0.56	0.58	0.72	0.83	0.89	0.87	0.88	0.82	0.80	0.75	0.69	0.65	0.67	0.65	0.64	0.71
28/4 - 10/16 · h=7.9 in · with 1.2 in insulation	0.75	0.42	0.36	0.78	0.73	0.80	0.81	0.86	0.85	0.80	0.68	0.66	0.75	0.70	0.68	0.66	0.67	0.66	0.73
28/4 - 8/16 · h=2 in · with 1.2 in insulation	0.65	0.18	0.16	0.37	0.40	0.53	0.59	0.71	0.73	0.79	0.80	0.78	0.70	0.67	0.57	0.53	0.52	0.55	0.66
28/4 - 8/16 · h=2.8 in · with 1.2 in insulation	0.65	0.24	0.20	0.48	0.53	0.62	0.71	0.71	0.77	0.76	0.73	0.71	0.66	0.61	0.56	0.54	0.54	0.61	0.71
28/4 - 8/16 · h=3.9 in · with 1.2 in insulation	0.65	0.26	0.28	0.56	0.56	0.67	0.72	0.73	0.70	0.76	0.72	0.67	0.65	0.59	0.55	0.55	0.55	0.56	0.65
28/4 - 8/16 · h=7.9 in · with 1.2 in insulation	0.60	0.44	0.38	0.66	0.65	0.69	0.70	0.70	0.66	0.65	0.59	0.57	0.62	0.61	0.57	0.56	0.55	0.57	0.66
29/3 - 10/16 · h=2 in · with 1.2 in insulation	0.75	0.18	0.17	0.32	0.38	0.51	0.61	0.75	0.81	0.91	0.95	0.92	0.86	0.79	0.68	0.62	0.61	0.62	0.77
29/3 - 10/16 · h=2.8 in · with 1.2 in insulation	0.75	0.20	0.19	0.44	0.53	0.63	0.71	0.86	0.92	0.94	0.92	0.87	0.80	0.70	0.63	0.62	0.65	0.69	0.76
29/3 - 10/16 · h=3.9 in · with 1.2 in insulation	0.75	0.28	0.29	0.58	0.59	0.67	0.83	0.90	0.90	0.92	0.85	0.80	0.73	0.65	0.62	0.64	0.59	0.58	0.64
29/3 - 10/16 · h=7.9 in · with 1.2 in insulation	0.75	0.36	0.29	0.71	0.74	0.78	0.81	0.84	0.81	0.79	0.68	0.67	0.74	0.71	0.69	0.64	0.62	0.63	0.73
29/3 - 8/16 · h=2 in · with 1.2 in insulation	0.65	0.19	0.17	0.35	0.39	0.49	0.55	0.72	0.73	0.80	0.82	0.78	0.69	0.64	0.57	0.53	0.52	0.57	0.70
29/3 - 8/16 · h=2.8 in · with 1.2 in insulation	0.65	0.25	0.22	0.52	0.51	0.60	0.71	0.73	0.75	0.77	0.76	0.69	0.66	0.61	0.54	0.52	0.54	0.61	0.68
29/3 - 8/16 · h=3.9 in · with 1.2 in insulation	0.60	0.32	0.33	0.55	0.56	0.61	0.74	0.73	0.70	0.73	0.69	0.66	0.60	0.56	0.52	0.54	0.53	0.54	0.61
29/3 - 8/16 · h=7.9 in · with 1.2 in insulation	0.65	0.42	0.38	0.64	0.65	0.66	0.66	0.68	0.68	0.67	0.60	0.59	0.62	0.59	0.57	0.53	0.52	0.56	0.65
30/2 - 10/16 · h=2 in · with 1.2 in insulation	0.70	0.19	0.16	0.34	0.43	0.54	0.59	0.80	0.84	0.93	0.92	0.87	0.79	0.70	0.58	0.53	0.47	0.48	0.64
30/2 - 10/16 · h=2.8 in · with 1.2 in insulation	0.70	0.21	0.19	0.45	0.50	0.63	0.72	0.84	0.87	0.91	0.87	0.81	0.71	0.62	0.54	0.54	0.56	0.60	0.67
30/2 - 10/16 · h=3.9 in · with 1.2 in insulation	0.75	0.25	0.26	0.55	0.58	0.72	0.87	0.84	0.88	0.84	0.80	0.74	0.66	0.60	0.58	0.57	0.55	0.53	0.61
30/2 - 10/16 · h=7.9 in · with 1.2 in insulation	0.70	0.42	0.38	0.76	0.78	0.77	0.79	0.81	0.78	0.76	0.65	0.63	0.69	0.64	0.61	0.57	0.55	0.54	0.61
30/2 - 8/16 · h=2 in · with 1.2 in insulation	0.60	0.20	0.19	0.37	0.38	0.51	0.57	0.70	0.73	0.74	0.75	0.71	0.63	0.60	0.53	0.48	0.45	0.47	0.62
30/2 - 8/16 · h=2.8 in · with 1.2 in insulation	0.65	0.23	0.21	0.48	0.49	0.59	0.68	0.71	0.76	0.77	0.73	0.68	0.60	0.54	0.48	0.49	0.50	0.59	0.66
30/2 - 8/16 · h=3.9 in · with 1.2 in insulation	0.60	0.33	0.33	0.55	0.54	0.61	0.72	0.71	0.70	0.71	0.67	0.62	0.58	0.51	0.51	0.50	0.50	0.51	0.56
30/2 - 8/16 · h=7.9 in · with 1.2 in insulation	0.60	0.44	0.37	0.66	0.64	0.68	0.65	0.67	0.64	0.62	0.57	0.58	0.59	0.55	0.51	0.49	0.50	0.52	0.61
6/2 - 10/32 · h=2 in · with 1.2 in insulation	0.85	0.16	0.15	0.31	0.38	0.50	0.58	0.80	0.87	1.01	1.10	1.10	1.08	1.05	0.91	0.83	0.79	0.80	1.02
6/2 - 10/32 · h=2.8 in · with 1.2 in insulation	0.90	0.19	0.18	0.39	0.42	0.61	0.71	0.91	1.03	1.07	1.10	1.08	1.00	0.93	0.86	0.84	0.89	0.92	0.92
6/2 - 10/32 · h=3.9 in · with 1.2 in insulation	0.90	0.28	0.27	0.53	0.51	0.70	0.88	1.01	1.09	1.05	1.03	0.98	0.92	0.84	0.85	0.90	0.83	0.78	0.79
6/2 - 10/32 · h=7.9 in · with 1.2 in insulation	0.90	0.38	0.30	0.82	0.90	0.93	0.99	1.05	0.98	0.95	0.82	0.81	0.95	0.92	0.90	0.88	0.88	0.86	0.89
6/2 - 8/32 · h=2 in · with 1.2 in insulation	0.80	0.16	0.15	0.30	0.36	0.48	0.59	0.80	0.88	0.99	1.06	1.03	0.99	0.95	0.84	0.79	0.74	0.78	0.92
6/2 - 8/32 · h=2.8 in · with 1.2 in insulation	0.85	0.20	0.18	0.39	0.50	0.62	0.73	0.89	0.99	1.03	1.00	1.00	0.94	0.85	0.77	0.77	0.81	0.85	0.91
6/2 - 8/32 · h=3.9 in · with 1.2 in insulation	0.85	0.28	0.29	0.56	0.60	0.70	0.94	0.93	0.98	1.00	0.95	0.93	0.83	0.77	0.76	0.81	0.77	0.77	0.76
6/2 - 8/32 · h=7.9 in · with 1.2 in insulation	0.85	0.39	0.32	0.81	0.75	0.85	0.87	0.95	0.91	0.88	0.77	0.77	0.87	0.82	0.83	0.79	0.81	0.81	0.85
irreg./2 - 10/16 · h=2 in · with 1.2 in insulation	0.80	0.16	0.13	0.29	0.34	0.51	0.59	0.83	0.91	0.98	1.04	1.03	0.98	0.88	0.78	0.70	0.65	0.67	0.80
irreg./2 - 10/16 · h=2.8 in · with 1.2 in insulation	0.80	0.19	0.16	0.42	0.49	0.60	0.73	0.92	1.00	1.02	1.01	0.99	0.88	0.80	0.69	0.68	0.73	0.74	0.79
irreg./2 - 10/16 · h=3.9 in · with 1.2 in insulation	0.85	0.28	0.26	0.54	0.57	0.74	0.92	0.94	0.98	0.97	0.95	0.89	0.81	0.74	0.74	0.75	0.69	0.68	0.72
irreg./2 - 10/16 · h=7.9 in · with 1.2 in insulation	0.80	0.38	0.36	0.81	0.85	0.86	0.94	0.97	0.85	0.86	0.77	0.75	0.85	0.82	0.78	0.73	0.71	0.68	0.69
irreg./2 - 4/8 · h=2 in · with 1.2 in insulation	0.60	0.20	0.18	0.38	0.42	0.49	0.52	0.61	0.63	0.65	0.64	0.64	0.60	0.58	0.54	0.53	0.52	0.57	0.67
irreg./2 - 4/8 · h=2.8 in · with 1.2 in insulation	0.60	0.25	0.21	0.48	0.48	0.56	0.58	0.62	0.65	0.63	0.63	0.61	0.58	0.56	0.54	0.53	0.56	0.59	0.69
irreg./2 - 4/8 · h=3.9 in · with 1.2 in insulation	0.55	0.32	0.34	0.51	0.50	0.57	0.60	0.61	0.60	0.62	0.60	0.58	0.58	0.55	0.52	0.54	0.54	0.56	0.60
irreg./2 - 4/8 · h=7.9 in · with 1.2 in insulation	0.55	0.38	0.34	0.52	0.53	0.55	0.58	0.55	0.55	0.58	0.55	0.53	0.57	0.56	0.52	0.53	0.53	0.54	0.63
irreg./2 - 8/16 · h=2 in · with 1.2 in insulation	0.75	0.18	0.15	0.34	0.40	0.52	0.58	0.77	0.83	0.92	0.95	0.91	0.86	0.81	0.70	0.62	0.61	0.63	0.76
irreg./2 - 8/16 · h=2.8 in · with 1.2 in insulation	0.75	0.23	0.20	0.41	0.49	0.60	0.75	0.85	0.87	0.91	0.87	0.84	0.79	0.70	0.64	0.61	0.65	0.69	0.75
irreg./2 - 8/16 · h=3.9 in · with 1.2 in insulation	0.75	0.34	0.32	0.55	0.60	0.71	0.84	0.88	0.85	0.85	0.83	0.81	0.75	0.66	0.64	0.66	0.63	0.64	0.69
irreg./2 - 8/16 · h=7.9 in · with 1.2 in insulation	0.75	0.50	0.43	0.75	0.61	0.77	0.84	0.85	0.79	0.76	0.69	0.70	0.73	0.71	0.69	0.65	0.65	0.69	0.67
irreg./3 - 10/16 · h=2 in · with 1.2 in insulation	0.80	0.16	0.15	0.29	0.38	0.49	0.58	0.80	0.87	0.98	1.04	1.03	1.02	0.98	0.86	0.77	0.71	0.73	0.86
irreg./3 - 10/16 · h=2.8 in · with 1.2 in insulation	0.85	0.20	0.19	0.40	0.50	0.63	0.77	0.91	0.97	1.04	1.05	1.01	0.94	0.86	0.77	0.75	0.79	0.81	0.85
irreg./3 - 10/16 · h=3.9 in · with 1.2 in insulation	0.85	0.27	0.27	0.54	0.57	0.70	0.89	0.93	1.00	0.99	0.97	0.94	0.84	0.77	0.76	0.80	0.73	0.71	0.75
irreg./3 - 10/16 · h=7.9 in · with 1.2 in insulation	0.85	0.45	0.38	0.82	0.86	0.92	1.02	0.96	0.88	0.91	0.78	0.76	0.86	0.87	0.85	0.81	0.80	0.78	0.84
irreg./3 - 4/8 · h=2 in · with 1.2 in insulation	0.60	0.20	0.18	0.39	0.44	0.49	0.56	0.62	0.63	0.66	0.65	0.64	0.61	0.59	0.56	0.54	0.53	0.58	0.68
irreg./3 - 4/8 · h=2.8 in · with 1.2 in insulation	0.60	0.24	0.20	0.52	0.51	0.57	0.61	0.63	0.65	0.67	0.65	0.62	0.59	0.56	0.54	0.53	0.55	0.62	0.72
irreg./3 - 4/8 · h=3.9 in · with 1.2 in insulation	0.55	0.32	0.31	0.53	0.51	0.57	0.61	0.61	0.59	0.62	0.61	0.58	0.57	0.55	0.53	0.54	0.52	0.55	0.63
irreg./3 - 4/8 · h=7.9 in · with 1.2 in insulation	0.55	0.37	0.33	0.56	0.54	0.57	0.58	0.56	0.56	0.58	0.54	0.52	0.57	0.56	0.54	0.54	0.56	0.58	0.63
irreg./3 - 8/16 · h=2 in · with 1.2 in insulation	0.75	0.20	0.18	0.31	0.39	0.47	0.59	0.78	0.82	0.90	0.96	0.92	0.89	0.84	0.75	0.67	0.65	0.68	0.85
irreg./3 - 8/16 · h=2.8 in · with 1.2 in insulation	0.75	0.22	0.19	0.43	0.49	0.60	0.74	0.82	0.88	0.90	0.91	0.89	0.82	0.74	0.67	0.65	0.67	0.75	0.80
irreg./3 - 8/16 · h=3.9 in · with 1.2 in insulation	0.75	0.27	0.27	0.55	0.57	0.69	0.82	0.85	0.86	0.89	0.85	0.82	0.77	0.71	0.68	0.69	0.68	0.70	0.76
irreg./3 - 8/16 · h=7.9 in · with 1.2 in insulation	0.75	0.40	0.36	0.75	0.73	0.81	0.87	0.82	0.79	0.78	0.72	0.67	0.75	0.74	0.73	0.67	0.69	0.73	0.78
irreg./4 - 10/16 · h=2 in · with 1.2 in insulation	0.80	0.17	0.17	0.30	0.36	0.46	0.58	0.77	0.84	0.94	1.03	1.05	1.06	0.99	0.89	0.78	0.77	0.78	0.93
irreg./4 - 10/16 · h=2.8 in · with 1.2 in insulation	0.85	0.21	0.19	0.41	0.47	0.62	0.73	0.88	0.95	1.06	1.05	1.05	0.96	0.90	0.83	0.76	0.85	0.88	0.89
irreg./4 - 10/16 · h=3.9 in · with 1.2 in insulation	0.85	0.26	0.26	0.56	0.58	0.67	0.85	0.93	1.00	0.99	0.98	0.94	0.88	0.80	0.79	0.82	0.80	0.74	0.78
irreg./4 - 10/16 · h=7.9 in · with 1.2 in insulation	0.85	0.45	0.39	0.89	0.84	0.88	0.96	0.97	0.91	0.90	0.81	0.77	0.89	0.87	0.87	0.84	0.85	0.84	0.89
irreg./4 - 8/16 · h=2 in · with 1.2 in insulation	0.75	0.18	0.16	0.33	0.38	0.50	0.55	0.75	0.81	0.90	0.93	0.92	0.89	0.84	0.77	0.72	0.67	0.73	0.83
irreg./4 - 8/16 · h=2.8 in · with 1.2 in insulation	0.80	0.22	0.21	0.46	0.51	0.62	0.72	0.83	0.88	0.91	0.91	0.90	0.85	0.81	0.71	0.69	0.72	0.78	0.84
irreg./4 - 8/16 · h=3.9 in · with 1.2 in insulation	0.80	0.33	0.32	0.56	0.55	0.69	0.86	0.85	0.89	0.89	0.85	0.83	0.75	0.72	0.69	0.71	0.68	0.67	0.72
irreg./4 - 8/16 · h=7.9 in · with 1.2 in insulation	0.75	0.38	0.38	0.74	0.71	0.82	0.87	0.84	0.80	0.80	0.73	0.69	0.77	0.76	0.77	0.72	0.74	0.76	0.82

Measured values as a table (88 measurements)

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Last updated: 11/04/2026

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