The answer would depend upon what code and standard applies in that jurisdiction and to that particular type of house.
For example, NFPA 101 Life Safety Code (2009) has no requirement for any fire rating of any doors in a one- or two-family dwelling.
yes and no. anything made of cold rolled steel will resist fire.. the question is what kind of steel door and whether you are asking if it has an authorized fire label or not. residential steel - clad doors usually can get a 20minute UL fire rating, but it has to be labeled by the manufacturer ahead of time.. you need a commercial level hollow metal door to get a fire rating up to 3 hours. you can not have polyurethane core. it has to be foam or honeycomb.
Yes, the requirements for smoke alarms and fire doors are often separate, although there could be overlapping requirements that reduce the need for one if you have more of the other, in specific cases.
I just bought a new house and need to purchase shower doors. What is a good store to buy shower doors?
doors' e.g.: in the house, all the doors' hinges need to be greased. But I would still contest the need to use the possessive for door (inanimate) - in the example above, I feel it is better as "...the hinges of all the doors..."
Fire rating is related to the materials used and the openings they cover. You may use sheetrock/gypsum/plasterboard in various thicknesses to make a fire-resistant wall up to two hours. You may need inter-stud firestops, and you may need to take care of any windows, doors, or other openings through the fire rated partition. Your local building or fire code will specify how thick the layers must be, and the other details.
MDF comes in different grades including fire rating (FR). You will need to speak to your supplier as to which one. Remember though that you will likly need to make sure whatever you use with it (paint, laminate coverings) are FR too.
my doors are hard to open and the outside door want lock. do i need house jacks?
Without knowing your heat load, insulation rating, loss from windows and doors, it is pretty safe to figure 1 ton per 400 sq. ft.
Fire doors should never be propped open (with a fire extinguisher or anything else) because it will defeat the purpose of having fire and smoke separation during a fire. A self-closing fire door must be allowed to function properly for safety of the occupants who may need the extra time to safely escape through other exit doors. It would be a fire-code violation to prop open a fire door, which could result in fines or other discipline.
A fire pit should be at least 10 feet away from a house to ensure safety.
If you can safely get to the pets, then remove them from the house; if not, then they would need to be left in the house.
It is best to have at least two fire extinguishers for your house. A dry chemical fire extinguisher would be good and it can be purchased on eBay.