Wood is generally accepted as the preferred surface treatment in general architectural spaces, as well as critical listening and performance spaces. However, to provide a reverberation time appropriate for the intended use of a space, absorption must often be added. Traditionally this is accomplished with upholstered fiberglass or stretch fabric systems or drapery. Topperfo offers an alternative approach. Topperfo offers the ability to utilize flat attractive perforated wooden panels with proprietary "T" perforations, which are small on the surface and larger on the rear, to provide absoprtion in precisely the frequency range desired. Topperfo panels consist of a series of perforations with a single or double diameter hole, providing a sound path through the panel. By varying the hole spacing, the single or double hole diameter, and the rear air cavity depth and content, one can obtain absorption over a wide variety of frequencies. Various hole diameters and spacings are offered.

Problem
Wood paneling provides a handsome visual architectural appearance, however, exclusive use of flat panels may not offer enough statistical absorption to achieve a desired reverberation time.

Solution
Topperfo perforated wood panels offer the handsome appearance of wood paneling, coupled with sound absorption over a very wide range of selectable frequency ranges. This offers architects and acousticians an alternative to fabric wrapped panels or stretch fabric systems.

M Perforation: Provides absorption and reverberation control in the mid to high frequency region	T- Perforation: Provides absorption and reverberation control in the mid to low frequency region	Reflector: Contains no rear perforations and provides minimal absorption, but offers a matching face profile to complement absorptive panels.

Nomenclature

Topperfo product names include (in mm) the horizontal perforation spacing, the vertical perforation spacing, the hole diameter, the type of hole M or T, and the percent open area, plus the type of core (standard Class A or moisture resistant) and the species and finish of the face veneer. Face finishes are available in natural wood veneers, painted colors, melamine finishes and metallic finishes.

Flat or curved panels:
Topperfo is only available in panels up to 47.87” (1216 mm) x 11.94’ (3640 mm). To obtain a uniform 16 mm spacing between perforations in adjacent panels, the center-to-center hole spacing (including a joint separation of at least 3 mm for thermal expansion) must be16 mm.

Layin Tiles:
23 3/4” x 23 3/4” (603 x 603 mm) and 23 3/4” x 47 3/4” (603 x 1207 mm) concealed grid ceiling tiles.

Finishes
Topperfo is available in any wood veneer species and finish, any painted finish, a wide selection of cost-effective melamine finishes and a selected range of metallic finishes. Special flitch requests can be accommodated.

Due to different computer monitor settings, it is impossible to display accurate images of finishes. Therefore, we are deliberately not displaying sample finishes, as these images are not helpful and may lead to more confusion. We will attempt to satisfy all finish requests, by supplying a sample to match all paint colors, wood veneer species and finishes or melamine finish.

Core
All core material is 16 mm Class A MDF. Moisture resistant cores are also available for humid environments. See Important Information in the side bar.

Absorption
One of the advantages of Topperfo is that you can select from a wide variety of designs to provide absorption in a specific frequency range or over a broad range of frequencies to fine tune the room’s reverberation time. The frequency range is determined by the percent open area and the type of M or T hole utilized, and the air cavity depth behind or above the panels.

Installation
Topperfo panels can be installed by screwing through blind holes drilled halfway through the panels into wood battens.