Ceiling that can diffuse sound

Scattering or random redistribution of a sound wave from a surface

Absorbs sound and keeps it too (thermal storage)

Absorbs sound and transmits excess sound to the next room

A value given in decibels, which is determined by measuring sound pressure levels at a certain frequency in the

source and receiving rooms.

Reflection

The fraction of the randomly incident sound power which is absorbed, or otherwise not reflected.

A single-number index for rating how absorptive a particular material is

This is a single-number rating of a material’s or assembly’s barrier effect.

Material with the lowest STC rating

Material with the highest STC rating

Meaning of SSL

What is a pump used to move water vertically from the underground cistern to an

overhead tank?

What is a pump connected to a fire sprinkler system to maintain pressure in the sprinkler

pipes?

What is a pump designed to increase water supply pressure where inadequate water

pressure exists?

What is a pump that uses a rotating impeller to move water and pressurize the discharge

flow?

What is the pump used under the elevator pit?

Among the selection, which is the MOST expensive wash basin option?

In electrical connections, when is CEI issued in a building?

These are electrical enclosures intended for outdoor use.