Air delivery system having adjustable flame-blocking filters
An air delivery system is configured to deliver air to an enclosed structure and may include at least one air channel configured to deliver air to or receive air from the enclosed structure, at least one component disposed within the at least one air channel, and at least one flame-blocking filter removably and adjustably secured within the at least one air channel. The at least one flame-blocking filter is configured to isolate the at least one component from a source of excessive temperature or flames. The at least one flame-blocking filter is configured to allow air to pass therethrough under normal operating conditions, and to block air and flames from passing therethrough when exposed to the excessive temperature or the flames.
1. An air delivery system configured to deliver air to an enclosed structure, the air delivery system comprising:
a housing having at least one air channel for delivering or receiving air from the enclosed structure;
an energy exchanger disposed within the at least one air channel, the energy exchanger being configured to condition a return air stream from the enclosed structure using an outdoor air stream;
a return air inlet channel upstream of the energy exchanger and configured to receive and direct the return air stream through the energy exchanger;
a supply air outlet channel downstream of the energy exchanger and configured to outlet the conditioned air stream as supply air to the enclosed structure;
an outside air inlet channel upstream of the energy exchanger and configured to receive and direct an outdoor air stream through the energy exchanger;
an exhaust air outlet channel downstream of the energy exchanger and configured to outlet the outdoor air to an exterior of the housing as hot exhaust air; and
at least one flame-blocking filter disposed within the at least one air channel and separated from the energy exchanger by a distance, the flame-blocking filter comprising:
an outer frame configured to be removably and adjustably inserted into the at least one channel of the air delivery system, the outer frame defining an air opening such that air flows through the air opening during normal operation of the air delivery system; and
an intumescent filter member secured to the outer frame and having a plurality of air passages configured to allow air to flow therethrough during the normal operation of the air delivery system, wherein at least a portion of the distance between the at least one flame-blocking filter and the energy exchanger is void of any additional components and defines an open air space, wherein the intumescent filter member has a first thickness when in an inactive non-heated state, wherein the intumescent material is configured to expand to a greater second thickness when in an active heated state, and wherein the intumescent material closes the plurality of air passages when in the active heated state.
2. The air delivery system of claim 1 , wherein the intumescent filter member comprises one or more of a mesh, grid, lattice, one or more sheets, one or more panels, or foam material.
3. The air delivery system of claim 1 , wherein the intumescent filter member has beams crossing the air opening in at least one direction, the beams spaced apart and arranged in one of a horizontal alignment, a vertical alignment, a checker pattern, or a mesh.
4. The air delivery system of claim 1 , wherein each of the plurality of air passages is shaped as a rectangle, square, circle, oval, hexagon, or polygon.
5. The air delivery system of claim 1 , wherein the outer frame includes one or more features configured to be slidably retained by at least one track of the air delivery system.
6. The air delivery system of claim 1 , further comprising:
an air filter disposed within the at least one air channel, wherein the at least one flame-blocking filter is arranged between the air filter and the energy exchanger.
7. The air delivery system of claim 1 , wherein the at least one flame-blocking filter comprises:
a first flame-blocking filter disposed within the return air inlet channel; and
a second flame-blocking filter disposed within the outside air inlet channel.
8. The air delivery system of claim 7 , wherein the at least one flame-blocking filter further comprises:
a third flame-blocking filter disposed within the supply air outlet channel; and
a fourth flame-blocking filter disposed within the exhaust air outlet channel.
9. The air delivery system of claim 1 , wherein the at least one flame blocking filter is adjustably secured within an interior of the housing and is adjustable between a first position and a second position, wherein the flame-blocking filter is essentially out of an air flow path of air circulating through the at least one air channel in the first position and the flame blocking filter is inserted into the air flow path in the second position.