This proposed rule would amend the Federal Manufactured Home Construction and Safety Standards by adopting certain recommendations made to HUD by the Manufactured Housing Consensus Committee (MHCC).  The National Manufactured Housing Construction and Safety Standards Act of 1974 (the Act) requires HUD to publish all proposed revised construction and safety standards submitted by the MHCC.  This proposed rule is based on the third set of MHCC recommendations to update and improve various aspects of the Manufactured Housing Construction and Safety Standards.  HUD has reviewed those proposals and has made several editorial revisions to the proposals which were reviewed and accepted by the MHCC.  This rule proposes to add new standards that would establish requirements for carbon monoxide detection, stairways, fire safety considerations for attached garages, and for draftstops when there is a usable space above and below the concealed space of a floor/ceiling assembly and would establish requirements for venting systems to ensure that proper separation is maintained between the air intake and exhaust systems.