Flat panels are the most common architectural wood ceiling. Real wood, flush to the ceiling plane, no visible mechanical systems. The look is clean. The engineering is straightforward.

Penner builds flat panels in three configurations within one product family:

Standard (Mach 4) is the solid wood surface. No perforations, no slots. Use it where absorption isn’t required or where a continuous wood plane is the priority.

Perforated (Mach 4.1) adds precision-drilled holes backed by acoustic fleece. Sound passes through the perforations and gets absorbed by the backing material. Hole diameter and spacing are configurable to hit your NRC target.

Slotted Acoustical (Mach 4.2) uses linear groove patterns on the face with backside perforations for higher NRC performance. The grooves add a textured look while the dual-mechanism construction (face slots plus back perforations) increases absorption beyond what either approach achieves alone.

Same core construction and attachment methods across configurations. Switching from standard to perforated doesn’t restart your timeline or change your install method.