 [. . . ] · After opening the carton,  unpack and inspect the unit and lamp for damage. If lamp is damaged,  cracked or broken,  do not touch lamp or other contents in carton. · In case of accidental exposure to internal contents of lamp,  wash hands and any other affected skin area with mild detergent.  [. . . ] However,  when deciding on a suitable location,  the mounting screw head can not be in the shaded area of template. (See Figure 5)
Figure 1

Figure 2

Figure 3

Figure 4 Head of mounting screw CAN NOT be located in shaded area

Figure 5

WARNING: Never expose eyes or skin to UVC light from any source. Looking directly at the UVC light may cause permanent eye damage or blindness. Attach the UV-Aire mounting base onto the plenum with the supplied sheet metal screws. (Refer to template as shown in Figure 3) This must be tight in order to activate the built in safety switch. (See Figure 7) The power cord must be 90° to the viewport hole on the mounting base. With the ballast pressed against the mounting base,  rotate the ballast clockwise 90°. Do not wire the unit into the appliances 24 volt fan or thermostat circuit. NOTE: The viewport hole is made of glass and will not allow any UVC rays to pass through. If blue glow is not seen,  make sure the base is properly installed onto duct. There is a proving switch located on the base that needs to be seated properly onto the duct. Make sure when installing the base the plated washer on the switch is raised approximately 3/16". With aluminum or foil tape,  seal all joints and seams of the plenum near the mounting location to reduce any direct viewing of light. 

Figure 6

Figure 7

Figure 8

WARNING: Never expose eyes or skin to UVC light from any source. Looking directly at the UVC light may cause permanent eye damage or blindness.  [. . . ] UV lamps contain a small amount of mercury,  like a typical fluorescent lamp. Check with your local waste management authority for local disposal or recycling requirements. According to the EPA's Universal Waste Rule,  these types of lamps may be disposed of into household waste.  [. . . ]