According to the National Electric Code (NEC) a plenum is a "compartment or chamber to which one or more air ducts are connected and [which] forms part of the air distribution system." In other words, the open space above your ceiling extends above other rooms in the same building or is open to ducts that connect it to other parts of the building. In a plenum ceiling air can circulate through the air ducts to the whole building.

You most certainly can have plenum installed if you wish. The NEC does not require it though, so the decision is really up to you. Just remember that Plenum is more costly to install than PVC. See similar questions...

Yes, the power packs' low voltage wiring is suitable for use in Plenum ceilings. Install power packs in approved electrical enclosures. Install in accordance with state, local and national electrical codes. Yes! The NEC has stated that Class 1 and Class 2 wires can occupy the same enclosure as long as the rating of the wires equal or exceed the maximum circuit rating. The power pack wiring is rated 600V for the Class one wires and 300V for the Class two wires. See NEC section 300-3(c). See similar questions...

Plenum cable has a metal sheath inside that meets required wiring code for permanent installation. If you were to make a projector a permanent part of a conference room, for example, you would choose cable with plenum. Non-plenum cable is suitable for temporary installations. See similar questions...

All of our UL listed standard Ty-Rap brand cable ties are plenum rated. This includes the colored ties. The black weather resistant ties are not listed for plenum applications. The Catamount brand ties are not listed for plenum applications. See similar questions...

It is a limit on the amount of taxes you must pay on your residence. If you qualify your home for a 65 and older or disabled person homestead exemption for school taxes, the school taxes on that home can't increase as long as you own and live in that home. The tax ceiling is the amount you pay in the year that you qualified for the 65 - and - older or disabled person exemption. The school taxes on your home may go below the ceiling but not above the amount of the ceiling. See similar questions...

Heating coils in the ceiling can work very well. Some issues to think about are that the work is often inaccessible and heat losses upward can be high unless extra insulation is added. You would lose the comfort advantage of warm floors, but a radiant ceiling application is nevertheless very comfortable. Furniture placement is not affected. See similar questions...

In the Santa Clara Valley the cost of living, particularly housing, is such that even 300% of poverty here is barely comparable to the 250% legislatively established for Healthy Families throughout the entire state. Moreover, it is believed that families earning over 300% FPL are more likely to have access to employer sponsored health insurance. See similar questions...

Try to take a number of samples (5) in multiple locations. The ceiling material is man-mixed and thus you could miss the detection of asbestos in "this spot" when it might be one inch over in "that spot". Place the samples into a zip lock food storage bag and send it to the laboratory with a check for $35.00. Include your name and address, telephone number and fax number (if you have one). Any contractor with workers must follow OSHA rules. OSHA requires that no employee be exposed to asbestos. See similar questions...

Your installation is simplest of all. The air cleaner is simply surface mounted to the ceiling. The SE 400 and SE 800 have an attractive, low profile design. Use lag bolts to safely support the air cleaner from your ceiling joists. See similar questions...

Yes. Halar ties have the same UL listing as standard ties. Halar material is low-smoke and has good chemical resistance. See similar questions...

First, there's an investment in hardware and wiring. You need to have N motes attached to an N-port serial multiplexor (or a computer with N serial ports). All the motes need to be wired for power as well. This part can be time-consuming and expensive. Our 55-mote ceiling array cost on the order of $10,000, not including the costs of the motes themselves. This is just the cost of the serial multiplexors, cabling, and our custom serial and daisy-chained power board. See similar questions...

Our Ceiling Tiles, Styrofoam, Royal, Classic & Modern are made of self-extinguishing uniform extruded polystyrene foam a/k/a Styrofoam. Grand Ceiling Tiles have a PVC facing. Our 24" x 24" ceiling tiles are made of PVC. For more information please see below sections. See similar questions...

The Glass Ceiling consists of invisible, illegal and immoral artificial barriers which impede equal employment, support and salary compensation for African Americans, other minorities and women. While the Glass Ceiling cannot be seen or touched, it is easily felt and devastating. The effects are demoralizing and often overwhelm their victims. The Glass Ceiling was created and perpetrated by deep-seated prejudices based on unfounded believes against minorities and women. See similar questions...

The contract will provide you with a sufficient guarantee for your eligible export operations. JLGC's responsibility for any loss that occurs with respect to you not receiving the value of your exports is limited by a pre-agreed credit ceiling for each of your clients abroad. This means that you should consider a sufficient credit ceiling to cover the outstanding expected payment amount by each of your clients at the time you export your products to him. See similar questions...

The ceiling is 17 metres high and is the only completely stone-vaulted gothic-style building in the southern hemisphere. See similar questions...

The flame spread of a given product is a calculated number based on the duration and amount of flame propagated across it. The flame spread is relative to cement board resulting in a 0 and red oak resulting in a 100. The lower the value the better. CertainTeed's Mineral Fiber Acoustical ceilings are Class A and are classified by Underwriters Laboratory as having a flame spread of 25 or less. See similar questions...

The 2nd, 3rd and 4th floors have metal z-bar (running north to south) between the ceiling drywall and the original wood ceiling. A stud finder will help you find where the z-bar is placed in the ceiling. Fastening to the z-bar will give you a much better hold than only using the ceiling's drywall. See similar questions...

If you are 150cm (5ft), with the extra 4 ft reach mentioned above then you can easily reach the average 9 ft ceiling. See similar questions...

Acoustics is usually very broadly defined as "the science of sound." The term "Room Acoustics" can be more narrowly defined as the shaping and equipping of an enclosed space to obtain the best possible conditions for faithful hearing of wanted sound and the direction and the reduction of unwanted sound. It deals primarily with the control of sound which originates within a single enclosure, rather than its transmission between rooms. See similar questions...