Header and chute components of a refrigeration air distribution system have fastener attachment implements disposed thereon such that the header and chute components, or successive chute components, can be easily attached and detached with respect to each other by end-user customer personnel at on-site field locations. It is proposed that the electric motor drive a planet carrier on which the planet wheels are pivoted. The mounting bracket nose is configured for insertion under the end flange of the gutter, such that the mounting bracket is rotated rearwardly along a generally vertical arc about the nose toward the rear wall of the gutter, and shifted laterally into a skewed orientation within the gutter interior. After a simple column chromatography, optically pure compounds were obtained. Accordingly, the remote user can return e-mail message to the user registered on the received e-mail message.