What is a vibration isolation curb?

What is a vibration isolation curb?

Top of all Vibration isolation curb systems are level with pitches built into curb when deck slopes. Vibration isolation curb systems are designed to provide a minimum of 90% isolation efficiency with 2″ deflection.

What is a plenum curb?

Plenum curb will convert a dedicated down discharge roof top unit into a plenum curb. Pre-Fabricated Plenum roof curbs are available in the following: Insulated. Non-insulated. Vibration isolated.

What are roof curbs?

A roof curb is an elevated platform on a roof that supports some piece of equipment or roof penetration. Because roof curbs are sometimes a part of a roof, they must be able to keep out moisture and debris, while providing a spot to anchor the equipment.

What is mechanical isolator?

A mechanical vibration isolator is a flexible support used to decouple a material from forced vibration. Springs are commonly used as isolators to minimize the transmitted vibrational force. These springs may involve steel coil, rubber, pneumatic, fluid damping, or combination of one or more.

How do roof curbs work?

The curb creates an opening in a roof, separating the roofing material and providing structural support for the equipment that will sit on it. In an RTU application, the inside of the curb will contain supports where ducts will hang so the air can flow through the roof into the inside of the building.

How are roof curbs installed?

In order to install roof curbs, contractors must cut a hole in the roof, secure the roof curbs in place, and then place the roofing materials around the sides of the roof curb.

How do you select a vibration isolator?

Selecting the Right Vibro-Isolators®

1. The maximum load that must be supported.
2. The number of mounts supporting the load.
3. The frequency of the disturbing vibration.
4. Any restrictions on the size or style of the mount based on space limitations or assembly considerations.

What is a restrained spring isolator?

Easyflex Model EFRSI Seismic Control Restrained Spring Isolators are recommended as a noise and vibration isolator for mechanical equipment located near critically quiet areas when the equipment to be isolated has significant changes of weight during maintenance operations and for equipment subjected to seismic events.

How does vibration isolator work?

Passive vibration isolation makes use of materials and mechanical linkages that absorb and damp these mechanical waves. Active vibration isolation involves sensors and actuators that produce disruptive interference that cancels-out incoming vibration.

What is the function of vibration isolator?

The purpose of vibration isolation is to control unwanted vibration so that its adverse effects are kept within acceptable limits. Vibrations originating from machines or other sources are transmitted to a support structure such as a facility floor, causing a detrimental environment and unwanted levels of vibration.

What are rooftop curbs made of?

Curbs with a length and width of less than 36” are constructed of 20 gauge steel and curbs greater than or equal to 36” in length and width are constructed of 18 gauge steel. All roof curbs feature air tight, water tight, continuously welded corners and have 3″ continuous flashing.

How does a vibration isolation curb system work?

All curb systems are water tight and plenum applications are air tight utilizing internal flex duct. Top of all Vibration isolation curb systems are level with pitches built into curb when deck slopes. Vibration isolation curb systems are designed to provide a minimum of 90% isolation efficiency with 2″ deflection.

How are roof curbs and isolation curbs designed?

Rooftop rails consist of upper and lower frames separated by springs and rest on top of architectural roof curbs. Isolation curbs incorporate the roof curb and rooftop rail into their design. Roof curb isolation systems are designed with springs that have static deflections to meet the design criteria.

Do you need cross bracing for isolation curb?

The seal may not be penetrated for isolator adjustment. The isolation curb system shall be complete with cross-bracing as required as a part of the upper and lower assemblies. Supply and return flex connector support hardware shall be supplied for installation by the contractor in the field.

What is upper support rail for vibration isolation?

The upper support rail shall consist of a structural channel with sufficient elevation above the spring to preclude interference with the rooftop equipment and permit access to inspect the isolation system after placement of the rooftop equipment. Support of the RTU by weather seal attachment bolt heads is not permitted.