Door Heater Humidistat: (item #550). 1-1/2"H x 3"W x 4-1/2"L,. UL and CSA recognized. Adjustable range: 20-80%, with on/off settings. Needed to control door heaters. Mounted separately, and connected to the Cooler Controller by low-voltage wiring, the optional humidistat monitors the relative humidity of the air near the reach-in cooler doors and is connected with low-voltage 2-wire cable to the Cooler Controller. If there are anti-sweat door heaters, the Controller will switch them off whenever the relative humidity exceeds the setting on the humidistat. We recommend that when the humidistat is first connected, the door heater toggle switch on the Cooler Controller be switched off. That way, the humidistat can be adjusted to allow door heater operation only after door fogging or sweating has begun to cause a problem. The proper setting can then be found with a minimum of unnecessary heater operation. Shipping info: 2"H x 4"W x 8"L; .5 lb. $65

Temperature Sensor Extension Cable: (item #568-xx'); 3-conductor, 22 gauge tinned copper wires, foil-shielded, stranded copper wire with PVC plenum-rated insulation. When the length of the cables attached to the sensors that come with the Cooler Controller (1' and 15') or the Outside Air Package (30') are too short to reach from the Controller to the point at which a temperature is to be monitored, sensor extension cable is needed. To ensure accurate temperature readings you cannot use just any old wire. The connections should be soldered and heat shrink-protected. Shipping info: .016 lb./foot $1/foot

Summer Plug: (item #527); 9" diameter x 3"; Black, flexible, elastomeric plastic, insulated with 2" of extruded polystyrene, for an airtight fit in the exhaust and the intake damper units from last spring frost to first fall frost to minimize summer heat gain and condensation. Chain-mounted for easy storage next to opening. Outside air system should be switched off while plugs are in place. Now an Option. Summer plugs used to be standard equipment on Freeaire systems with outside air. However, sometimes even the simplest maintenance item, like putting in the plugs in the outside air intake and exhaust units at the beginning of summer and taking them out at the end, seems like too much trouble. An owner/manager can usually remember this easy procedure, but often young or untrained helpers do not have a clue what to do or when. That is why we have made putting the Freeaire into its "summer mode" unnecessary and the summer plugs optional. This is possible because we have increased the insulation in the intake and exhaust units to discourage condensation during hot and humid summer weather. Although the super-insulated summer plugs are still the best way to prevent any infiltration of warm summer air into the cooler, energy efficiency will increase and more money will be saved by allowing the outside air system to operate every minute it can, all year long. Now the outside air system will be ready to operate whenever the outside air is cool enough, whether it is a late frosty night in June or an early cold snap in August. There is no more need to remember to switch over twice a year. Shipping info: Usually shipped installed. Add 2 lbs. $45

Upflow Circulating Fan: (item #530); This can be used in place of the Circ Circulating fan (item #531) that is standard equipment with the Basic Freeaire System. It is designed to be hung from the ceiling and attached to a dealer-supplied 24 gauge galvanized sheetmetal 10' x 90° elbow and enough 10" diameter x 24" long pieces of galvanized duct to reach to within about 6" of the floor. This allows the coldest air in the space to be picked up off the floor and thrown across ceiling of the room. This is an excellent way to ensure complete mixing of the air and a constant temperature throughout the space, as the air is mixed both vertically and horizontally. However, we now usually recommend the downflow model (item #531) because it does not involve the use of any duct pipe which is added expense and takes up valuable space near walls which could better be used for product storage. To order the upflow circulating fan with your Freeaire system add a "U", as in 499-U and 500-U. There is no extra charge. However, you will want to order enough duct pipe (see items #518 and #525 below) to almost reach the floor. Fan: 10" diameter axial fan; 550 cfm (free air); 115 volts; 36 watts; 1650 rpm; permanent split capacitor motor; polycarbonate fan blades; aluminum housing; UL Component Recognized and CSA Certified; Dayton brand; finger guard. Housing: 20 gauge galvanized steel; ceiling-mounted; 12" x 10.5' x 6.5" Shipping info: 18"H x 11"W x 12"L, 10 lbs. To order saparately: $225.

Duct Pipe: (item #518); 10" diameter x 24"x 24 gauge galvanized steel $18

Elbow: (item #525); 10" diameter x 24 gauge galvanized steel $19 Use these two items to attach to the upflow circulating fan (item (#530). Both of these items can be also used for ducting either the intake or exhaust air through thick walls, flat roofs, or longer distances. Smooth inside walls ensure low pressure loss of the air flowing through them. If ducting intake air through a heated or semi-heated space you will want to add insulation as well (use item 506 below). To avoid shipping costs, both of these items are usually best obtained locally. Shipping info: Pipe: 24"H x 10"W x 10"L; 6 lbs. Elbow:13"H x 10"W x 10"L; 4 lbs.

Flat Roof Vent Pipe Package: (item #520). This is designed for the intake or exhaust of air through a flat roof. It consists of a cast aluminum ring for mounting on the roof and supporting a vertical 10" duct pipe (not supplied). Also included are a galvanized "china" cap with 1/4"mesh rodent and bird screen, an EPDM rubber roofing flashing/collar ready for gluing to the roof surface, and mounting hardware. You may also want to order enough lengths of 10" straight duct pipe (item #518) to pass from below the ceiling to the desired height above the roof. To order a Freeaire system with outside air with 2 flat roof vent packages instead of the wallcaps, at no extra cost, add an "R" to the system, as in 495-R and 500-R. Shipping info: 14"H x 14"W x 14"L; 7 lbs $90

Filter: (item #517); Box of 12:(item #517-box). 16" x 16" x 2" extended-surface (pleated), High-capacity, disposable filter; arrestance rating of 92 %; UL Classified, Class 2. The filter for the intake air in each outside air package should be changed every year, although dirtier locations may require changing more often. A clean filter will maximize airflow and keep your outside air system working in peak efficiency. Shipping info: Single:16"H x 16"W x 2"L, .7 lbs. Box: 16"H x 16"W x 24"L; 9 lbs. $10/ea; $72/box of 12.

Insulated Flexible Duct: (item #506-box). (R-value=6.0) Sold in full 10" diameter x 25' boxes only. This is the easiest way to connect either the intake or exhaust units with the outside envelope of the building. The insulation greatly reduces the transfer of heat to the intake air as it passes through heated or semi-heated spaces as well as heat loss from heated spaces to the outside via the exhaust duct. To avoid shipping costs, this item is usually best obtained locally. Shipping info: 14"H x 14"W x 30"L, 18 lbs $58

Angle Ring: (item #512); Cast Aluminum ,10" I.D. x 13" O.D. x 1-1/8"; 6 mounting holes. This item is useful to provide support for and trim around intake or exhaust duct as it passes through walls or ceilings when connecting a walk-in with the outside. Shipping info: 2"H x 13"W x 13"L; 3 lbs $28

Insulated End Panel: (item #537) (#19-1/2" x 19-1/2", 20 gauge galvanized sheetmetal panel with 1" rigid fiberglass insulation makes transition from intake fan housing or filter housing to 10" duct. This is to be used if the Intake Fan Housing (item #536) and the Filter Housing (item #535) need to be separated, or when the open side of either housing cannot make an airtight seal due to an irregular surface. Mounting holes mate with these two housings. Having to use an end panel is usually easily avoided. Shipping info: 20"H x 20"W x 4"L, 6 lbs $45

Adjustable Elbow: (item #524); Galvanized 10" duct elbow with an adjustable collar that clamps to the intake damper housing where it protrudes into the walk-in cooler, and directs the incoming air up to 90° to aim it precisely where it is needed. It is especially helpful where the intake damper cannot be located in the best location to disperse the air into an elongated or odd-shaped space. Can be used with summer plug. Shipping info: 14"H x 14"W x 14"L, 7 lbs $65

DPDT Power Relay: (item #639); with dust cover; Controls up to two 30-amp circuits with the Cooler Controller operating the 120-volt coil. Dayton brand. Shipping info: 4"H x 4"W x 6"L, 1.5 lbs $62

SPST Power Relay: (item #642); with dust cover; Controls one 30-amp circuit with the Cooler Controller operating the 120-volt coil. Dayton brand. Shipping info: 4"H x 4"W x 6"L, 1.5 lbs $49

3-Phase Relay: (item # 657); This definite purpose mechanical contactor controls one 600-volt, 20 FLA 3-phase circuit with the Cooler Controller operating the 120-volt coil. The enclosure is a NEMA type 1. Square D brand Shipping info: 6"H x 5"W x 9"L, 4 lbs $119

These three relays will handle almost every refrigeration load encountered in the field. The Cooler Controller can control other devices as long as the coil or control signal operates on a 120V 10-amp circuit.

Evaptm Fan Motor: (item#638); This 88-watt 1/15 hp 3.3" diameter permanent split capacitor (PSC) evaporator fan motor replaces many standard shaded-pole evaporator fan motors. The length is 5" from the end of the motor to the mounting studs at the beginning of the 5/16" x 2" shaft. 1625 rpm; 115 volts; Dayton brand. Capacitor: 4 MFD, GE brand. Shipping info: 6"H x 4"W x 8"L, 6 lbs $110

Clockwise 10" & 12" Evaporator Fan Blades: (10": item #637; 12": item #636) These fit the Evap fan motor above and replaces the counterclockwise fan blades that might be in place on the fan motor that are being replaced. (When looking at the motor from the shaft end, blades that rotate counterclockwise will need to be replaced). Shipping info: 2"H x 12"W x 12"L, 1 lb. #637: $23; #636: $29

Strobe Light Alarm: (item #651); The model 2001 Cooler Controller controls a 12 volt transformer which powers a low voltage 3.5" diameter x 4" blinking strobe light signaling a too-warm or a too-cold temperature inside the walk-in. This strobe light can be located wherever the person who needs to know can see it. Shipping info: 6"H x 4"W x 8"L; 2 lbs. $95