Excessive metal will deflect radio frequency in a direction that may not be in line with the receiver of your remote control. Interference of your radio frequency can cause the remote control to not respond properly to the hand-held transmitter. Hearth & Home Technologies has many built in safety functions to ensure that your remote control and fireplace operate in harmony. For this reason the receiver of the remote should not be installed to the very back of the fireplace. Large metal artwork can interfere with radio frequency.