Hertz is a unit of frequency (of change in state or cycle in a sound wave, alternating current, or other cyclical waveform) of one cycle per second.
The Anthony 2400F Glulam is a superior glued laminated beam and header for use where reliable engineered wood applications are required. Anthony 24F Glulam is an economical alternative to LVL and PSL in many standard structural applications where the high strength and stiffness values are not needed. Anthony's Glulam is readily available through stocking dealers. The 3-1/2 and 5-1/2 widths are available which match 2x4 and 2x6 wall framing.
The three most common types of duct material used in home construction are metal, rigid fiberglass. duct board, and flex-duct. Both metal and fiberglass duct board are rigid and installed in pieces, while flex-duct comes in long sections. Flex-duct is usually installed in a single, continuous piece between the register and plenum box or. plenum box and air handler. Be careful not to tear the soft lining material. The flex-duct must also.