The residential door should open inward for security reasons. By example… if one of the seasonal “college-aged magazine subscription salesmen” come to your door and decide, when you’re opening the door, to force their way in. It’s a lot easier for the homeowner to block the door from opening inward than it would be to keep the door from opening outward.
Jeff
I was glad my doors open in last winter ha. ha.
Marcel 
Just for interest, from Ontario Building Code:
**[FONT=Times New Roman][size=2]9.6.8. Resistance to Forced Entry
9.6.8.1. Application
(1) [/size][/FONT][FONT=Times New Roman][size=2]Except as permitted in Sentence (2), this Subsection applies to,
(a) swinging entrance doors to [/size][/FONT][FONT=Times New Roman][size=2]dwelling units[/size][/FONT][FONT=Times New Roman][size=2],
(b) swinging doors between [/size][/FONT][FONT=Times New Roman][size=2]dwelling units [/size][/FONT][FONT=Times New Roman][size=2]and attached garages or other ancillary spaces, and
© swinging doors that provide access directly or indirectly from a [/size][/FONT][FONT=Times New Roman][size=2]storage garage [/size][/FONT][FONT=Times New Roman][size=2]to a [/size][/FONT][FONT=Times New Roman][size=2]dwelling unit[/size][/FONT][FONT=Times New Roman][size=2].
[/size][/FONT][FONT=Times New Roman]size=2 [/size][/FONT][FONT=Times New Roman][size=2]Sentence (1) does not apply to exterior doors to garages and to other ancillary spaces.
[/size][/FONT][FONT=Times New Roman][size=2][FONT=Times New Roman][size=2][FONT=Times New Roman][size=2]9.6.8.7. Outward Swinging Doors
[/size][/size][/FONT][FONT=Times New Roman][size=2](1) **[/size][/FONT][FONT=Times New Roman][size=2]Except for storm doors or screen doors, doors described in Sentence 9.6.8.1.(1) that swing outward shall be provided
with hinges or pins so that the doors cannot be removed when they are in the closed position.
[/size][/FONT][/FONT][/size][/FONT]