Fortified doors are designed to withstand various levels of force and impact, depending on their construction and purpose. The type of bullet a fortified door can stop will largely depend on the materials used in its construction and the level of reinforcement.
For example, a heavily fortified door made of steel or reinforced with steel plates can potentially stop handgun bullets such as 9mm, .40 S&W, or .45 ACP. However, it may not be as effective against higher caliber rounds like .357 Magnum or .44 Magnum.
For protection against higher caliber bullets or even rifle rounds, specialized armored doors with thicker and stronger materials such as ballistic steel or bullet-resistant glass may be necessary.
Here are a few examples of specialized armored doors known for their strength:
Blast-Resistant Doors: These doors are designed to withstand the force of explosions and are often used in areas prone to terrorist attacks or industrial accidents. They are constructed with reinforced steel or composite materials and may feature special mechanisms to absorb and dissipate blast energy.
Ballistic-Resistant Doors: These doors are engineered to resist penetration from bullets and projectiles. They are typically made with multiple layers of ballistic steel and may incorporate other materials such as Kevlar or ceramic armor plates to enhance their protective capabilities.
Forced Entry-Resistant Doors: These doors are designed to withstand attempts at forced entry using tools such as crowbars, sledgehammers, or cutting torches. They are often constructed with heavy-gauge steel or reinforced composite materials and may feature reinforced locking mechanisms and hinges.
Fire-Rated Doors: While not specifically designed for security against physical attacks, fire-rated doors are engineered to withstand high temperatures and prevent the spread of fire and smoke. They are typically made with fire-resistant materials such as steel, gypsum, or composite panels and are rated based on their ability to withstand fire for a specified period of time.
High-Security Vault Doors: These doors are used to secure valuable assets such as cash, jewelry, or sensitive documents in banks, casinos, and government facilities. They are constructed with thick layers of hardened steel and feature advanced locking mechanisms such as time locks, combination locks, or biometric access control systems.
Overall, the strength of a specialized armored door depends on its design, construction, and intended use. High-security doors are often custom-engineered to meet specific requirements and may be tested and certified by independent organizations to ensure their performance under extreme conditions. It's important to note that the effectiveness of a fortified door also depends on factors such as the angle of impact, distance from the door, and the specific type of ammunition being fired.
